diff --git a/CODE_OF_CONDUCT.md b/CODE_OF_CONDUCT.md
index 8ff7ea61d..1009fb520 100644
--- a/CODE_OF_CONDUCT.md
+++ b/CODE_OF_CONDUCT.md
@@ -1,6 +1,7 @@
 ---
 title: Code of Conduct
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 ## Code of Conduct
 
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 56b4bb922..447d39d75 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -1,6 +1,7 @@
 ---
 title: Contributing to the IntelliJ Platform SDK
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 This document describes our contribution guidelines for the open source IntelliJ Platform SDK documentation and sample code.
 Before you begin contributing content to the SDK, please read this page thoroughly as well as the [Code of Conduct](/CODE_OF_CONDUCT.md) and [License](https://github.com/JetBrains/intellij-sdk-docs/blob/master/LICENSE.txt) documents.
diff --git a/appendix/resources/consulting.md b/appendix/resources/consulting.md
index 40c6be8c5..76df6b43d 100644
--- a/appendix/resources/consulting.md
+++ b/appendix/resources/consulting.md
@@ -1,6 +1,7 @@
 ---
 title: Consulting
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 The following independent companies and individuals provide paid plugin consulting and development services.
 
diff --git a/appendix/resources/useful_links.md b/appendix/resources/useful_links.md
index 19db1f5e7..69c01210b 100644
--- a/appendix/resources/useful_links.md
+++ b/appendix/resources/useful_links.md
@@ -3,6 +3,7 @@ title: Useful Links
 redirect_from:
   - /resources.html
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 The following links represent useful resources for working with the _IntelliJ Platform_ and creating plugins.
 
diff --git a/basics.md b/basics.md
index 4d58c8b7f..896179e4a 100644
--- a/basics.md
+++ b/basics.md
@@ -1,6 +1,7 @@
 ---
 title: Quick Start Guide
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 This section covers the basics of working with *IntelliJ Platform*.
 It will familiarize you with the working environment, project structure, and frequently used API components.
diff --git a/basics/action_system.md b/basics/action_system.md
index aac36964e..7334d82f2 100644
--- a/basics/action_system.md
+++ b/basics/action_system.md
@@ -1,6 +1,7 @@
 ---
 title: Action System
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 ## Introduction
 The actions system is an extension point that allows plugins to add their items to IntelliJ Platform-based IDE menus and toolbars. 
diff --git a/basics/architectural_overview/documents.md b/basics/architectural_overview/documents.md
index dd6a383bf..d394c10bb 100644
--- a/basics/architectural_overview/documents.md
+++ b/basics/architectural_overview/documents.md
@@ -1,6 +1,7 @@
 ---
 title: Documents
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 A document is an editable sequence of Unicode characters, which typically corresponds to the text contents of a virtual file. Line breaks in a document are _always_ normalized to `\n`. The *IntelliJ Platform* handles encoding and line break conversions when loading and saving documents transparently.
 
diff --git a/basics/architectural_overview/file_view_providers.md b/basics/architectural_overview/file_view_providers.md
index 1600272c1..d87dc3d00 100644
--- a/basics/architectural_overview/file_view_providers.md
+++ b/basics/architectural_overview/file_view_providers.md
@@ -1,6 +1,7 @@
 ---
 title: File View Providers
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 A file view provider ([`FileViewProvider`](upsource:///platform/core-api/src/com/intellij/psi/FileViewProvider.java)) manages access to multiple PSI trees within a single file.
 
diff --git a/basics/architectural_overview/files.md b/basics/architectural_overview/files.md
index fbe4da2e4..ba06722a5 100644
--- a/basics/architectural_overview/files.md
+++ b/basics/architectural_overview/files.md
@@ -1,6 +1,7 @@
 ---
 title: Files
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 * [Virtual File System](/basics/virtual_file_system.md)
 * [Virtual Files](virtual_file.md)
diff --git a/basics/architectural_overview/general_threading_rules.md b/basics/architectural_overview/general_threading_rules.md
index ec6323a4d..43655618d 100644
--- a/basics/architectural_overview/general_threading_rules.md
+++ b/basics/architectural_overview/general_threading_rules.md
@@ -1,6 +1,7 @@
 ---
 title: General Threading Rules
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 ## Read/write lock
 
diff --git a/basics/architectural_overview/modifying_psi.md b/basics/architectural_overview/modifying_psi.md
index 15e4913d2..0fedf4763 100644
--- a/basics/architectural_overview/modifying_psi.md
+++ b/basics/architectural_overview/modifying_psi.md
@@ -1,6 +1,7 @@
 ---
 title: Modifying the PSI
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 The PSI is a read-write representation of the source code as a tree of elements corresponding to the structure of a source
 file. You can modify the PSI by *adding*, *replacing*, and *deleting* PSI elements.
diff --git a/basics/architectural_overview/navigating_psi.md b/basics/architectural_overview/navigating_psi.md
index 229dc706b..2bd7f0f0c 100644
--- a/basics/architectural_overview/navigating_psi.md
+++ b/basics/architectural_overview/navigating_psi.md
@@ -1,6 +1,7 @@
 ---
 title: Navigating the PSI
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 There are three main ways to navigate the PSI: *top-down*, *bottom-up*, and using *references*. In the first scenario, 
 you have a PSI file or another higher-level element (for example, a method), and you need to find all elements that match a
diff --git a/basics/architectural_overview/psi.md b/basics/architectural_overview/psi.md
index 758dc5c3f..41aa5e69d 100644
--- a/basics/architectural_overview/psi.md
+++ b/basics/architectural_overview/psi.md
@@ -1,6 +1,7 @@
 ---
 title: Program Structure Interface (PSI)
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 The Program Structure Interface, commonly referred to as just PSI, is the layer in the _IntelliJ Platform_ that is responsible for parsing files and creating the syntactic and semantic code model that powers so many of the platform's features.
 
diff --git a/basics/architectural_overview/psi_elements.md b/basics/architectural_overview/psi_elements.md
index 9581e0637..a41a13ded 100644
--- a/basics/architectural_overview/psi_elements.md
+++ b/basics/architectural_overview/psi_elements.md
@@ -1,6 +1,7 @@
 ---
 title: PSI Elements
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 A PSI (Program Structure Interface) file represents a hierarchy of PSI elements (so-called _PSI trees_). A single PSI file (itself being a PSI element) may contain several PSI trees in specific programming languages. A PSI element, in its turn, can have child PSI elements.
 
diff --git a/basics/architectural_overview/psi_files.md b/basics/architectural_overview/psi_files.md
index 870a6b4cb..aacabeb3e 100644
--- a/basics/architectural_overview/psi_files.md
+++ b/basics/architectural_overview/psi_files.md
@@ -1,6 +1,7 @@
 ---
 title: PSI Files
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 A PSI (Program Structure Interface) file is the root of a structure representing the contents of a file as a hierarchy of elements in a particular programming language.
 
diff --git a/basics/architectural_overview/psi_references.md b/basics/architectural_overview/psi_references.md
index 69ca99f6c..7e22d8837 100644
--- a/basics/architectural_overview/psi_references.md
+++ b/basics/architectural_overview/psi_references.md
@@ -1,6 +1,7 @@
 ---
 title: PSI References
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 A *reference* in a PSI tree is an object that represents a link from a *usage* of a certain element in the code
 to the corresponding *declaration*. *Resolving* a reference means locating the declaration to which a specific usage
diff --git a/basics/architectural_overview/virtual_file.md b/basics/architectural_overview/virtual_file.md
index 941a8b3f9..942146cee 100644
--- a/basics/architectural_overview/virtual_file.md
+++ b/basics/architectural_overview/virtual_file.md
@@ -1,6 +1,7 @@
 ---
 title: Virtual Files
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 A virtual file [`VirtualFile`](upsource:///platform/core-api/src/com/intellij/openapi/vfs/VirtualFile.java) is the *IntelliJ Platform's* representation of a file in a file system (VFS). Most commonly, a virtual file is a file in your local file system. However, the *IntelliJ Platform* supports multiple pluggable file system implementations, so virtual files can also represent classes in a JAR file, old revisions of files loaded from a version control repository, and so on.
 
diff --git a/basics/getting_started.md b/basics/getting_started.md
index 2a259a6bf..54107821b 100644
--- a/basics/getting_started.md
+++ b/basics/getting_started.md
@@ -1,6 +1,7 @@
 ---
 title: Creating Your First Plugin
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 This documentation section will help you get started with developing plugins for the *IntelliJ Platform*. You can use either [IntelliJ IDEA Community Edition](https://www.jetbrains.com/idea/download/) or [IntelliJ IDEA Ultimate](https://www.jetbrains.com/idea/download/) as your IDE (it is highly recommended to use the latest available version).  Both include the complete set of plugin development tools. To become more familiar with *IntelliJ IDEA*, please refer to the [IntelliJ IDEA Web Help](https://www.jetbrains.com/idea/help/).
 
diff --git a/basics/getting_started/creating_plugin_project.md b/basics/getting_started/creating_plugin_project.md
index 602823d33..35355b42b 100644
--- a/basics/getting_started/creating_plugin_project.md
+++ b/basics/getting_started/creating_plugin_project.md
@@ -3,6 +3,7 @@ title: Creating a Plugin Project
 redirect_from:
   - /basics/getting_started/creating_an_action.html
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 > **NOTE** For new projects, it is recommend to use [Gradle](/tutorials/build_system.md).
 
diff --git a/basics/getting_started/deploying_plugin.md b/basics/getting_started/deploying_plugin.md
index ee5fe4366..cf86e9da1 100644
--- a/basics/getting_started/deploying_plugin.md
+++ b/basics/getting_started/deploying_plugin.md
@@ -1,6 +1,7 @@
 ---
 title: Deploying a Plugin
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 Before your custom plugin can be used, it must be deployed: built, installed, and then enabled using Plugin Manager.
 
diff --git a/basics/getting_started/plugin_compatibility.md b/basics/getting_started/plugin_compatibility.md
index 4e135b8af..8da97da4a 100644
--- a/basics/getting_started/plugin_compatibility.md
+++ b/basics/getting_started/plugin_compatibility.md
@@ -1,6 +1,7 @@
 ---
 title: Plugin Compatibility with IntelliJ Platform Products
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 <style>
   table {
diff --git a/basics/getting_started/publishing_plugin.md b/basics/getting_started/publishing_plugin.md
index 7a8a0eb0c..6c45674c6 100644
--- a/basics/getting_started/publishing_plugin.md
+++ b/basics/getting_started/publishing_plugin.md
@@ -1,6 +1,7 @@
 ---
 title: Publishing a plugin
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 When your plugin is ready you can publish it to a plugin repository so that other users can install it. 
 You can choose to publish it on the [JetBrains Plugin Repository](https://plugins.jetbrains.com)
diff --git a/basics/getting_started/running_and_debugging_a_plugin.md b/basics/getting_started/running_and_debugging_a_plugin.md
index a82c9c8c8..1e9009195 100644
--- a/basics/getting_started/running_and_debugging_a_plugin.md
+++ b/basics/getting_started/running_and_debugging_a_plugin.md
@@ -1,6 +1,7 @@
 ---
 title: Running and Debugging a Plugin
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 It's possible to run and debug a plugin directly from the *IntelliJ IDEA*. You need a configured special profile (a *Plugin* Run/Debug configuration) that specifies the plugin module, VM parameters and other specific options. When you run such profile, it launches the IDE with your plugin installed.
 
diff --git a/basics/getting_started/setting_up_environment.md b/basics/getting_started/setting_up_environment.md
index 604739aa5..c84918d1b 100644
--- a/basics/getting_started/setting_up_environment.md
+++ b/basics/getting_started/setting_up_environment.md
@@ -1,6 +1,7 @@
 ---
 title: Setting Up a Development Environment
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 ### Preliminary Steps
 
diff --git a/basics/getting_started/update_plugins_format.md b/basics/getting_started/update_plugins_format.md
index 5c9944ad3..2bef19319 100644
--- a/basics/getting_started/update_plugins_format.md
+++ b/basics/getting_started/update_plugins_format.md
@@ -1,6 +1,7 @@
 ---
 title: Publishing a Plugin to a Custom Plugin Repository
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 If you intend to use a plugin repository _other than_ the [JetBrains Plugin Repository](https://plugins.jetbrains.com), 
 you will need to:
diff --git a/basics/getting_started/using_dev_kit.md b/basics/getting_started/using_dev_kit.md
index fb3e047fc..798bc8db8 100644
--- a/basics/getting_started/using_dev_kit.md
+++ b/basics/getting_started/using_dev_kit.md
@@ -1,6 +1,7 @@
 ---
 title: Using DevKit
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 > **NOTE** For new projects, it is recommend to use [Gradle](/tutorials/build_system.md).
 
diff --git a/basics/ide_development_instance.md b/basics/ide_development_instance.md
index 507e3882f..e94bdad5a 100644
--- a/basics/ide_development_instance.md
+++ b/basics/ide_development_instance.md
@@ -3,6 +3,7 @@ title: IDE Development Instances
 redirect_from:
   - /basics/settings_caches_logs.html
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 A JetBrains feature for developing plugins is running or debugging a plugin project from within an IntelliJ Platform-based IDE such as IntelliJ IDEA. 
 Selecting the [**Run**](getting_started/running_and_debugging_a_plugin.md) menu for a DevKit-based project, or the [**runIde**](/tutorials/build_system/prerequisites.md#running-a-simple-gradle-based-intellij-platform-plugin) task for a Gradle-based project will launch a _Development Instance_ of the IDE with the plugin enabled.
diff --git a/basics/indexing_and_psi_stubs.md b/basics/indexing_and_psi_stubs.md
index 25542a724..6b18a728b 100644
--- a/basics/indexing_and_psi_stubs.md
+++ b/basics/indexing_and_psi_stubs.md
@@ -1,6 +1,7 @@
 ---
 title: Indexing and PSI Stubs
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 ## Indices
 
diff --git a/basics/indexing_and_psi_stubs/file_based_indexes.md b/basics/indexing_and_psi_stubs/file_based_indexes.md
index 74b012f8b..7e739c462 100644
--- a/basics/indexing_and_psi_stubs/file_based_indexes.md
+++ b/basics/indexing_and_psi_stubs/file_based_indexes.md
@@ -1,6 +1,7 @@
 ---
 title: File-based Indexes
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 File-based indexes are based on a Map/Reduce architecture. Each index has a certain type of key and a certain type of value.
 
diff --git a/basics/indexing_and_psi_stubs/stub_indexes.md b/basics/indexing_and_psi_stubs/stub_indexes.md
index c3f28eee7..cc7d73e57 100644
--- a/basics/indexing_and_psi_stubs/stub_indexes.md
+++ b/basics/indexing_and_psi_stubs/stub_indexes.md
@@ -1,6 +1,7 @@
 ---
 title: Stub Indexes
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 ## Stub Trees
 
diff --git a/basics/intellij_coding_guidelines.md b/basics/intellij_coding_guidelines.md
index 36643afbb..47d66d63f 100644
--- a/basics/intellij_coding_guidelines.md
+++ b/basics/intellij_coding_guidelines.md
@@ -1,6 +1,7 @@
 ---
 title: IntelliJ Platform Coding Guidelines
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 If you are writing code that you would like to contribute to the IntelliJ Platform (either as a patch or as a plugin), following these guidelines will make it easier for the JetBrains development team to review and accept your changes.
 
diff --git a/basics/persisting_sensitive_data.md b/basics/persisting_sensitive_data.md
index 2646e72cd..94555ef2d 100644
--- a/basics/persisting_sensitive_data.md
+++ b/basics/persisting_sensitive_data.md
@@ -1,6 +1,7 @@
 ---
 title: Persisting Sensitive Data
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 The Credentials Store API allows you to securely store sensitive user data, like passwords, server URLs, etc.
 
diff --git a/basics/persisting_state_of_components.md b/basics/persisting_state_of_components.md
index bb7f63527..8481852bc 100644
--- a/basics/persisting_state_of_components.md
+++ b/basics/persisting_state_of_components.md
@@ -1,6 +1,7 @@
 ---
 title: Persisting State of Components
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 The *IntelliJ Platform* provides an API that allows components or services to persist their state between restarts of the IDE. You can use either a simple API to persist a few values, or persist the state of more complicated components using the [`PersistentStateComponent`](upsource:///platform/core-api/src/com/intellij/openapi/components/PersistentStateComponent.java) interface.
 
diff --git a/basics/platform_contributions.md b/basics/platform_contributions.md
index 371440e94..c3487eda0 100644
--- a/basics/platform_contributions.md
+++ b/basics/platform_contributions.md
@@ -1,6 +1,7 @@
 ---
 title: Contributing to the IntelliJ Platform
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 Please make sure to read the [Code of Conduct](../CODE_OF_CONDUCT.md).
 
diff --git a/basics/plugin_structure.md b/basics/plugin_structure.md
index fa3cca2c4..b620d184b 100644
--- a/basics/plugin_structure.md
+++ b/basics/plugin_structure.md
@@ -1,6 +1,7 @@
 ---
 title: Plugin Structure
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 Click the following topics to learn more about the plugin system structure and plugin lifecycles:
 
diff --git a/basics/plugin_structure/dynamic_plugins.md b/basics/plugin_structure/dynamic_plugins.md
index dee7ce875..0933c66c5 100644
--- a/basics/plugin_structure/dynamic_plugins.md
+++ b/basics/plugin_structure/dynamic_plugins.md
@@ -1,6 +1,7 @@
 ---
 title: Dynamic Plugins
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 > **WARNING** Please note that the information on this page is preliminary and might change.
 
diff --git a/basics/plugin_structure/plugin_actions.md b/basics/plugin_structure/plugin_actions.md
index e7508889a..53bcb44f8 100644
--- a/basics/plugin_structure/plugin_actions.md
+++ b/basics/plugin_structure/plugin_actions.md
@@ -1,6 +1,7 @@
 ---
 title: Plugin Actions
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 The *IntelliJ Platform* provides the concept of _actions_. An action is a class, derived from the [`AnAction`](upsource:///platform/editor-ui-api/src/com/intellij/openapi/actionSystem/AnAction.java) class, whose `actionPerformed()` method is called when the menu item or toolbar button is selected.
 
diff --git a/basics/plugin_structure/plugin_class_loaders.md b/basics/plugin_structure/plugin_class_loaders.md
index 6dc618905..8ad1b4676 100644
--- a/basics/plugin_structure/plugin_class_loaders.md
+++ b/basics/plugin_structure/plugin_class_loaders.md
@@ -1,6 +1,7 @@
 ---
 title: Plugin Class Loaders
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 A separate class loader is used to load the classes of each plugin. This allows each plugin to use a different version of a library, even if the same library is used by the IDE itself or by another plugin.
 
diff --git a/basics/plugin_structure/plugin_components.md b/basics/plugin_structure/plugin_components.md
index 9a7859e04..90850d79d 100644
--- a/basics/plugin_structure/plugin_components.md
+++ b/basics/plugin_structure/plugin_components.md
@@ -1,6 +1,7 @@
 ---
 title: Plugin Components
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 > **WARNING** When writing new plugins, you should avoid creating components, and you should migrate existing components in your plugins to services, extensions or listeners (see below).
 
diff --git a/basics/plugin_structure/plugin_configuration_file.md b/basics/plugin_structure/plugin_configuration_file.md
index e30ec1007..311ddd0c6 100644
--- a/basics/plugin_structure/plugin_configuration_file.md
+++ b/basics/plugin_structure/plugin_configuration_file.md
@@ -1,6 +1,7 @@
 ---
 title: Plugin Configuration File - plugin.xml
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 The following is a sample plugin configuration file. This sample showcases and describes all elements that can be used in the `plugin.xml` file.
 Additional information about configuring `<actions>` is available in the [Actions](/basics/action_system.md#registering-actions) section in Part II.
diff --git a/basics/plugin_structure/plugin_content.md b/basics/plugin_structure/plugin_content.md
index d36907e62..c14925105 100644
--- a/basics/plugin_structure/plugin_content.md
+++ b/basics/plugin_structure/plugin_content.md
@@ -1,6 +1,7 @@
 ---
 title: Plugin Content
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 The plugin `jar` file must contain:
 - the configuration file (`META-INF/plugin.xml`) ([Plugin Configuration File](plugin_configuration_file.md))
diff --git a/basics/plugin_structure/plugin_dependencies.md b/basics/plugin_structure/plugin_dependencies.md
index 70c08c4d1..017589534 100644
--- a/basics/plugin_structure/plugin_dependencies.md
+++ b/basics/plugin_structure/plugin_dependencies.md
@@ -1,6 +1,7 @@
 ---
 title: Plugin Dependencies
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 A plugin may depend on classes from other plugins, either bundled, third-party, or by the same author.
 This document describes the syntax for declaring plugin dependencies and optional plugin dependencies.
diff --git a/basics/plugin_structure/plugin_extension_points.md b/basics/plugin_structure/plugin_extension_points.md
index 3f01490a7..41a03b354 100644
--- a/basics/plugin_structure/plugin_extension_points.md
+++ b/basics/plugin_structure/plugin_extension_points.md
@@ -1,6 +1,7 @@
 ---
 title: Plugin Extension Points
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 > **NOTE** See [Plugin Extensions](plugin_extensions.md) for _using_ extension points in your plugin.
 
diff --git a/basics/plugin_structure/plugin_extensions.md b/basics/plugin_structure/plugin_extensions.md
index 59e063c2f..2c463bbe5 100644
--- a/basics/plugin_structure/plugin_extensions.md
+++ b/basics/plugin_structure/plugin_extensions.md
@@ -3,6 +3,7 @@ title: Plugin Extensions
 redirect_from:
     /basics/plugin_structure/plugin_extensions_and_extension_points.html
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 _Extensions_ are the most common way for a plugin to extend the functionality of the IntelliJ Platform in a way
 that is not as straightforward as adding an action to a menu or toolbar. The following are some of the most common
diff --git a/basics/plugin_structure/plugin_icon_file.md b/basics/plugin_structure/plugin_icon_file.md
index 50dc91d71..05c6c1f9e 100644
--- a/basics/plugin_structure/plugin_icon_file.md
+++ b/basics/plugin_structure/plugin_icon_file.md
@@ -1,6 +1,7 @@
 ---
 title: Plugin Logo
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 Beginning in version 2019.1, the IntelliJ Platform supports representing a plugin with a logo.
 A _Plugin Logo_ is intended to be a unique representation of a plugin's functionality, technology, or company.
diff --git a/basics/plugin_structure/plugin_listeners.md b/basics/plugin_structure/plugin_listeners.md
index 60134e7f0..0d7651672 100644
--- a/basics/plugin_structure/plugin_listeners.md
+++ b/basics/plugin_structure/plugin_listeners.md
@@ -1,6 +1,7 @@
 ---
 title: Plugin Listeners
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 > **NOTE** Defining listeners in `plugin.xml` is supported starting with version 2019.3 of the platform.
 
diff --git a/basics/plugin_structure/plugin_services.md b/basics/plugin_structure/plugin_services.md
index 62bc6fe6a..9b3ba1531 100644
--- a/basics/plugin_structure/plugin_services.md
+++ b/basics/plugin_structure/plugin_services.md
@@ -1,6 +1,7 @@
 ---
 title: Plugin Services
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 A _service_ is a plugin component loaded on demand when your plugin calls the `getService()` method of the [`ServiceManager`](upsource:///platform/core-api/src/com/intellij/openapi/components/ServiceManager.java) class.
 
diff --git a/basics/project_structure.md b/basics/project_structure.md
index e8191ec23..c3650aa67 100644
--- a/basics/project_structure.md
+++ b/basics/project_structure.md
@@ -1,6 +1,7 @@
 ---
 title: Project Structure
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 <!--TODO split into parts accordingly to the table of contents-->
 
diff --git a/basics/psi_cookbook.md b/basics/psi_cookbook.md
index 52277f406..60ead7e92 100644
--- a/basics/psi_cookbook.md
+++ b/basics/psi_cookbook.md
@@ -1,6 +1,7 @@
 ---
 title: PSI Cookbook
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 This page gives a list of recipes for the most common operations for working with the PSI (Program Structure Interface). Unlike [Developing Custom Language Plugins](/reference_guide/custom_language_support.md), it talks about working with the PSI of existing languages (such as Java).
 
diff --git a/basics/run_configurations.md b/basics/run_configurations.md
index 980d909f4..23261aeef 100644
--- a/basics/run_configurations.md
+++ b/basics/run_configurations.md
@@ -1,6 +1,7 @@
 ---
 title: Run Configurations
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 *Run Configurations* allow users to run a certain type of external processes from within the IDE, e.g. a script, an application, a server, etc. You can provide UI for the user to specify execution options, as well as an option to create a run configuration based on a specific location in the source code.
 
diff --git a/basics/run_configurations/run_configuration_execution.md b/basics/run_configurations/run_configuration_execution.md
index acebd4b88..f4a0c0c4c 100644
--- a/basics/run_configurations/run_configuration_execution.md
+++ b/basics/run_configurations/run_configuration_execution.md
@@ -1,6 +1,7 @@
 ---
 title: Execution
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 The standard execution of a run action goes through the following steps:
 
diff --git a/basics/run_configurations/run_configuration_management.md b/basics/run_configurations/run_configuration_management.md
index d9a18089d..adf8c535c 100644
--- a/basics/run_configurations/run_configuration_management.md
+++ b/basics/run_configurations/run_configuration_management.md
@@ -1,6 +1,7 @@
 ---
 title: Run Configuration Management
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 This document describes main classes to work with run configurations and common use case.
 
diff --git a/basics/testing_plugins/light_and_heavy_tests.md b/basics/testing_plugins/light_and_heavy_tests.md
index fe11bf3e7..e53231436 100644
--- a/basics/testing_plugins/light_and_heavy_tests.md
+++ b/basics/testing_plugins/light_and_heavy_tests.md
@@ -1,6 +1,7 @@
 ---
 title: Light and Heavy Tests
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 Plugin tests run in a real, rather than mocked, *IntelliJ Platform* environment and use real implementations for most of the application and project components/services. 
 
diff --git a/basics/testing_plugins/test_project_and_testdata_directories.md b/basics/testing_plugins/test_project_and_testdata_directories.md
index 67a70802d..4082d50b2 100644
--- a/basics/testing_plugins/test_project_and_testdata_directories.md
+++ b/basics/testing_plugins/test_project_and_testdata_directories.md
@@ -1,6 +1,7 @@
 ---
 title: Test Project and Testdata Directories
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 The test fixture creates a *test project* environment. Unless you customize the project creation, the test project will have one module with one source root called `src`. The files for the test project exist either in a temporary directory or in an in-memory file system, depending on which implementation of [`TempDirTestFixture`](upsource:///platform/testFramework/src/com/intellij/testFramework/fixtures/TempDirTestFixture.java) is used.
 
diff --git a/basics/testing_plugins/testing_highlighting.md b/basics/testing_plugins/testing_highlighting.md
index 2a9858f7f..835772089 100644
--- a/basics/testing_plugins/testing_highlighting.md
+++ b/basics/testing_plugins/testing_highlighting.md
@@ -1,6 +1,7 @@
 ---
 title: Testing Highlighting
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 A common task when writing plugin tests is testing various kinds of highlighting (inspections, annotators, parser error highlighting, etc.). The *IntelliJ Platform* provides a dedicated utility and markup format for this task.
 
diff --git a/basics/testing_plugins/testing_plugins.md b/basics/testing_plugins/testing_plugins.md
index 1c059257b..c5041d5e1 100644
--- a/basics/testing_plugins/testing_plugins.md
+++ b/basics/testing_plugins/testing_plugins.md
@@ -3,6 +3,7 @@ title: Testing Plugins
 redirect_from:
   - /basics/testing_plugins.html
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 Most of the tests in the *IntelliJ Platform* codebase are *model level functional tests*. What this means is the following:
 
diff --git a/basics/testing_plugins/tests_and_fixtures.md b/basics/testing_plugins/tests_and_fixtures.md
index c0ff64e68..1bf1650ac 100644
--- a/basics/testing_plugins/tests_and_fixtures.md
+++ b/basics/testing_plugins/tests_and_fixtures.md
@@ -1,6 +1,7 @@
 ---
 title: Tests and Fixtures
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 The *IntelliJ Platform* testing infrastructure is not tied to any specific test framework. In fact, the IntelliJ IDEA Team uses JUnit, TestNG and Cucumber for testing different parts of the project. However, most of the tests are written using JUnit 3.
 
diff --git a/basics/testing_plugins/writing_tests.md b/basics/testing_plugins/writing_tests.md
index b0f7e6a2a..1e7a07636 100644
--- a/basics/testing_plugins/writing_tests.md
+++ b/basics/testing_plugins/writing_tests.md
@@ -1,6 +1,7 @@
 ---
 title: Writing Tests
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 In most cases, once you have the necessary files copied to the test project and loaded into the in-memory editor, writing the test itself involves invoking your plugin code and has few dependencies on the test framework.
 
diff --git a/basics/types_of_plugins.md b/basics/types_of_plugins.md
index 9ed7596ae..b9ec6a02d 100644
--- a/basics/types_of_plugins.md
+++ b/basics/types_of_plugins.md
@@ -1,6 +1,7 @@
 ---
 title: Main Types of Plugins
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 Products based on the *IntelliJ Platform* can be modified and adjusted for custom purposes by adding plugins. All downloadable plugins are available at the [JetBrains Plugin Repository](https://plugins.jetbrains.com/).
 
diff --git a/basics/virtual_file_system.md b/basics/virtual_file_system.md
index f3922a4c4..f4fe25d85 100644
--- a/basics/virtual_file_system.md
+++ b/basics/virtual_file_system.md
@@ -1,6 +1,7 @@
 ---
 title: Virtual File System
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 The virtual file system (VFS) is a component of *IntelliJ Platform* that encapsulates most of its activity for working with files. It serves the following main purposes:
 
diff --git a/faq.md b/faq.md
index a75b1f3db..8d55af628 100644
--- a/faq.md
+++ b/faq.md
@@ -1,7 +1,7 @@
 ---
 title: Plugin Development FAQ
 ---
-
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 This FAQ is a topical index of questions that have been asked (and answered) on our
 [IntelliJ IDEA Open API and Plugin Development forum](https://intellij-support.jetbrains.com/hc/en-us/community/topics/200366979-IntelliJ-IDEA-Open-API-and-Plugin-Development).
diff --git a/intro/about.md b/intro/about.md
index 044de50b0..3bdc2c789 100644
--- a/intro/about.md
+++ b/intro/about.md
@@ -1,6 +1,7 @@
 ---
 title: About this Guide
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 This guide is split into several parts, similar to a text book. Each part builds on the content of the previous part, but it is not necessary to read the guide in order. The [Key Topics](key_topics.md) page aims to link to the pages that are necessary to be able to understand the architecture and get started building plugins.
 
diff --git a/intro/getting_help.md b/intro/getting_help.md
index d970ad4ca..0dae38cce 100644
--- a/intro/getting_help.md
+++ b/intro/getting_help.md
@@ -1,6 +1,7 @@
 ---
 title: Getting Help
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 ## Problems with the guide
 
diff --git a/intro/intellij_platform.md b/intro/intellij_platform.md
index d878bf9f3..c3feebd25 100644
--- a/intro/intellij_platform.md
+++ b/intro/intellij_platform.md
@@ -1,6 +1,7 @@
 ---
 title: What is the IntelliJ Platform?
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 The _IntelliJ Platform_ is not a product in and of itself but provides a platform for building IDEs. It is used to power JetBrains products such as [IntelliJ IDEA](https://www.jetbrains.com/idea/). It is also Open Source and can be used by third parties to build IDEs, such as [Android Studio](https://developer.android.com/studio/index.html) from Google.
 
diff --git a/intro/key_topics.md b/intro/key_topics.md
index 80add34ae..f2e30677d 100644
--- a/intro/key_topics.md
+++ b/intro/key_topics.md
@@ -1,6 +1,7 @@
 ---
 title: Key Topics
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 The _IntelliJ Platform_ is very large, and very capable, and its size and scope can initially be very daunting. This page is intended to list the key topics that a plugin author would be interested in, and provide quick links to the most common extension points.
 
diff --git a/intro/sdk_code_guidelines.md b/intro/sdk_code_guidelines.md
index 18cf0ccc9..d8ccd12a0 100644
--- a/intro/sdk_code_guidelines.md
+++ b/intro/sdk_code_guidelines.md
@@ -1,6 +1,7 @@
 ---
 title: Guidelines for Creating IntelliJ Platform SDK Code Samples
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 This document describes the coding guidelines used for authoring open-source IntelliJ Platform SDK code samples.
 Before you begin, please read this page thoroughly, as well as the [Code of Conduct](/CODE_OF_CONDUCT.md) and [License](https://github.com/JetBrains/intellij-sdk-docs/blob/master/LICENSE.txt) documents.
diff --git a/intro/sdk_style.md b/intro/sdk_style.md
index ee773a8a3..759f33d10 100644
--- a/intro/sdk_style.md
+++ b/intro/sdk_style.md
@@ -1,6 +1,7 @@
 ---
 title: Style Guide for SDK Documents
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 This document describes the writing style used in authoring open source IntelliJ Platform SDK documentation.
 Before you begin, please read this page thoroughly as well as the [Code of Conduct](/CODE_OF_CONDUCT.md) and [License](https://github.com/JetBrains/intellij-sdk-docs/blob/master/LICENSE.txt) documents.
@@ -29,6 +30,7 @@ In other words, to convert a `.md` file to HTML, it should look like this:
 ```yaml
 ---
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 Lorem ipsum...
 ```
diff --git a/platform/fundamentals.md b/platform/fundamentals.md
index 3e0461e6d..013d9c077 100644
--- a/platform/fundamentals.md
+++ b/platform/fundamentals.md
@@ -4,6 +4,7 @@ redirect_from:
   - /reference_guide.html
   - /basics/architectural_overview.html
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 This section describes the low level fundamental building blocks of the _IntelliJ Platform_:
 
diff --git a/plugin_repository/index.md b/plugin_repository/index.md
index bd06a11c2..8997ff2a4 100644
--- a/plugin_repository/index.md
+++ b/plugin_repository/index.md
@@ -12,6 +12,7 @@ redirect_from:
   - /plugin_repository/custom_channels.html
 
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 JetBrains provides an official plugins repository [plugins.jetbrains.com](https://plugins.jetbrains.com) for all IntelliJ Platform-based IDEs, 
 as well as TeamCity (limited functionality).
diff --git a/products/android_studio.md b/products/android_studio.md
index 33195ef0e..6f83414b3 100644
--- a/products/android_studio.md
+++ b/products/android_studio.md
@@ -1,6 +1,7 @@
 ---
 title: Android Studio Plugin Development
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 ## Introduction 
 Android Studio plugins extend or add functionality to the [Android Studio IDE](https://developer.android.com/studio).
diff --git a/products/app_code.md b/products/app_code.md
index de277f24c..bc32e1d0b 100644
--- a/products/app_code.md
+++ b/products/app_code.md
@@ -1,6 +1,7 @@
 ---
 title: AppCode Plugin Development
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 ## Introduction
 Plugin projects targeting [AppCode](https://www.jetbrains.com/objc/) can be developed using IntelliJ IDEA with the `gradle-intellij-plugin`.
diff --git a/products/clion.md b/products/clion.md
index f80a5691b..d14aa7698 100644
--- a/products/clion.md
+++ b/products/clion.md
@@ -1,6 +1,7 @@
 ---
 title: CLion Plugin Development
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 ## Introduction
 [CLion](https://www.jetbrains.com/clion/) is an IntelliJ Platform-based product.
diff --git a/products/data_grip.md b/products/data_grip.md
index 5ef204e25..868868594 100644
--- a/products/data_grip.md
+++ b/products/data_grip.md
@@ -1,6 +1,7 @@
 ---
 title: DataGrip Plugin Development
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 ## Introduction
 [DataGrip](https://www.jetbrains.com/datagrip/) is an IntelliJ Platform-based product.
diff --git a/products/dev_alternate_products.md b/products/dev_alternate_products.md
index 77f9ca960..e7594536d 100644
--- a/products/dev_alternate_products.md
+++ b/products/dev_alternate_products.md
@@ -1,6 +1,7 @@
 ---
 title: Plugins Targeting IntelliJ Platform-Based IDEs 
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 ## Introduction 
 Plugin projects can target IDEs other than IntelliJ IDEA, as long as the products are based on the [IntelliJ Platform](/intro/intellij_platform.md).
diff --git a/products/goland.md b/products/goland.md
index 18808dbde..c5af25caf 100644
--- a/products/goland.md
+++ b/products/goland.md
@@ -1,6 +1,7 @@
 ---
 title: GoLand Plugin Development
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 ## Introduction
 [GoLand](https://www.jetbrains.com/go/) is an IntelliJ Platform-based product.
diff --git a/products/idea.md b/products/idea.md
index c5ad96bc4..29e4800ce 100644
--- a/products/idea.md
+++ b/products/idea.md
@@ -1,6 +1,7 @@
 ---
 title: IntelliJ IDEA
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 * [Tomcat Integration](../reference_guide/tomcat_integration.md)
 * [Spring API](../reference_guide/frameworks_and_external_apis/spring_api.md)
diff --git a/products/phpstorm/existing_plugins.md b/products/phpstorm/existing_plugins.md
index 7a441f983..ed2b9f1bc 100644
--- a/products/phpstorm/existing_plugins.md
+++ b/products/phpstorm/existing_plugins.md
@@ -3,6 +3,7 @@ title: Example PhpStorm Third Party Plugins
 redirect_from:
   - /phpstorm/existing_plugins.html
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 This page lists some example PhpStorm plugins created by third party developers.
 
diff --git a/products/phpstorm/php_open_api.md b/products/phpstorm/php_open_api.md
index 105e61245..98b5c2d8f 100644
--- a/products/phpstorm/php_open_api.md
+++ b/products/phpstorm/php_open_api.md
@@ -3,6 +3,7 @@ title: PHP Open API
 redirect_from:
   - /phpstorm/php_open_api.html
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 ## Using php-openapi
 
diff --git a/products/phpstorm/phpstorm.md b/products/phpstorm/phpstorm.md
index 520e453db..c52d55477 100644
--- a/products/phpstorm/phpstorm.md
+++ b/products/phpstorm/phpstorm.md
@@ -5,6 +5,7 @@ redirect_from:
   - /phpstorm/setting_up_environment.html
   - /products/phpstorm/setting_up_environment.html
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 ## Introduction
 [PhpStorm](https://www.jetbrains.com/phpstorm/) is an IntelliJ Platform-based product. 
diff --git a/products/pycharm.md b/products/pycharm.md
index 5e68b3931..6ae5b0f72 100644
--- a/products/pycharm.md
+++ b/products/pycharm.md
@@ -1,6 +1,7 @@
 ---
 title: PyCharm Plugin Development
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 ## Introduction
 [PyCharm](https://www.jetbrains.com/pycharm/) is an IntelliJ Platform-based product.
diff --git a/products/rider.md b/products/rider.md
index e4544ae64..6e74425bd 100644
--- a/products/rider.md
+++ b/products/rider.md
@@ -1,6 +1,7 @@
 ---
 title: Rider Plugin Development
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 ## Introduction 
 Rider plugins are generally used to expose the functionality of a ReSharper plugin.
diff --git a/products/rubymine.md b/products/rubymine.md
index 93ffca0f4..535a032ad 100644
--- a/products/rubymine.md
+++ b/products/rubymine.md
@@ -1,6 +1,7 @@
 ---
 title: RubyMine Plugin Development
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 ## Introduction
 [RubyMine](https://www.jetbrains.com/ruby/) is an IntelliJ Platform-based product.
diff --git a/products/webstorm.md b/products/webstorm.md
index 8e86cb94e..27d432fca 100644
--- a/products/webstorm.md
+++ b/products/webstorm.md
@@ -1,6 +1,7 @@
 ---
 title: WebStorm Plugin Development
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 ## Introduction
 [WebStorm](https://www.jetbrains.com/webstorm/) is an IntelliJ Platform-based product.
diff --git a/reference_guide/api_changes/api_changes_list_2016.md b/reference_guide/api_changes/api_changes_list_2016.md
index 4b3679f75..690fc8311 100644
--- a/reference_guide/api_changes/api_changes_list_2016.md
+++ b/reference_guide/api_changes/api_changes_list_2016.md
@@ -1,6 +1,7 @@
 ---
 title: Incompatible Changes in IntelliJ Platform and Plugins API 2016.*
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 <!--
 See the note on how to document new problems on the main page reference_guide/api_changes_list.md 
diff --git a/reference_guide/api_changes/api_changes_list_2017.md b/reference_guide/api_changes/api_changes_list_2017.md
index 05cfe3878..b7e647aea 100644
--- a/reference_guide/api_changes/api_changes_list_2017.md
+++ b/reference_guide/api_changes/api_changes_list_2017.md
@@ -1,6 +1,7 @@
 ---
 title: Incompatible Changes in IntelliJ Platform and Plugins API 2017.*
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 <!--
 See the note on how to document new problems on the main page reference_guide/api_changes_list.md 
diff --git a/reference_guide/api_changes/api_changes_list_2018.md b/reference_guide/api_changes/api_changes_list_2018.md
index 4535c43bd..80c4d1aff 100644
--- a/reference_guide/api_changes/api_changes_list_2018.md
+++ b/reference_guide/api_changes/api_changes_list_2018.md
@@ -1,6 +1,7 @@
 ---
 title: Incompatible Changes in IntelliJ Platform and Plugins API 2018.*
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 <!--
 
diff --git a/reference_guide/api_changes/api_changes_list_2019.md b/reference_guide/api_changes/api_changes_list_2019.md
index ab146b1cb..e3cb329cf 100644
--- a/reference_guide/api_changes/api_changes_list_2019.md
+++ b/reference_guide/api_changes/api_changes_list_2019.md
@@ -1,6 +1,7 @@
 ---
 title: Incompatible Changes in IntelliJ Platform and Plugins API 2019.*
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 <!--
 Before documenting a breaking API change, please, make sure that the change cannot be avoided 
diff --git a/reference_guide/api_changes/api_changes_list_2020.md b/reference_guide/api_changes/api_changes_list_2020.md
index 02ecd12c1..79ed09087 100644
--- a/reference_guide/api_changes/api_changes_list_2020.md
+++ b/reference_guide/api_changes/api_changes_list_2020.md
@@ -1,6 +1,7 @@
 ---
 title: Incompatible Changes in IntelliJ Platform and Plugins API 2020.*
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 <!--
 Before documenting a breaking API change, please, make sure that the change cannot be avoided 
diff --git a/reference_guide/api_changes_list.md b/reference_guide/api_changes_list.md
index 7e06413d9..ce1197b29 100644
--- a/reference_guide/api_changes_list.md
+++ b/reference_guide/api_changes_list.md
@@ -1,6 +1,7 @@
 ---
 title: Incompatible Changes in IntelliJ Platform and Plugins API
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 <!--
 =============== DO NOT RENAME OR MOVE THIS FILE ===============
diff --git a/reference_guide/api_notable/api_notable.md b/reference_guide/api_notable/api_notable.md
index c9d509032..14ea56bcc 100644
--- a/reference_guide/api_notable/api_notable.md
+++ b/reference_guide/api_notable/api_notable.md
@@ -1,6 +1,7 @@
 ---
 title: Notable Changes and Features in IntelliJ Platform and Plugins API
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 The following pages list notable changes and new features in IDE releases.
 
diff --git a/reference_guide/api_notable/api_notable_list_2018.md b/reference_guide/api_notable/api_notable_list_2018.md
index d872a7e01..eb83c4a65 100644
--- a/reference_guide/api_notable/api_notable_list_2018.md
+++ b/reference_guide/api_notable/api_notable_list_2018.md
@@ -1,6 +1,7 @@
 ---
 title: Notable Changes in IntelliJ Platform and Plugins API 2018.*
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 # 2018.3 
 
diff --git a/reference_guide/api_notable/api_notable_list_2019.md b/reference_guide/api_notable/api_notable_list_2019.md
index 43e33b9b6..aa31c4753 100644
--- a/reference_guide/api_notable/api_notable_list_2019.md
+++ b/reference_guide/api_notable/api_notable_list_2019.md
@@ -1,6 +1,7 @@
 ---
 title: Notable Changes in IntelliJ Platform and Plugins API 2019.*
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 # 2019.3 
 
diff --git a/reference_guide/api_notable/api_notable_list_2020.md b/reference_guide/api_notable/api_notable_list_2020.md
index 6e8db11a5..a69d6b650 100644
--- a/reference_guide/api_notable/api_notable_list_2020.md
+++ b/reference_guide/api_notable/api_notable_list_2020.md
@@ -1,6 +1,7 @@
 ---
 title: Notable Changes in IntelliJ Platform and Plugins API 2020.*
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 We've published our roadmap for the IntelliJ Platform for 2020: [Part I](https://blog.jetbrains.com/idea/2019/12/intellij-platform-roadmap-for-2020/) [Part II](https://blog.jetbrains.com/idea/2020/01/intellij-based-ide-features-roadmap-for-2020/)
 
diff --git a/reference_guide/color_scheme_management.md b/reference_guide/color_scheme_management.md
index c1ef624aa..20500fc25 100644
--- a/reference_guide/color_scheme_management.md
+++ b/reference_guide/color_scheme_management.md
@@ -1,6 +1,7 @@
 ---
 title: Color Scheme Management
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 # Preface
 
diff --git a/reference_guide/custom_language_support.md b/reference_guide/custom_language_support.md
index 3094c621a..02789fca0 100644
--- a/reference_guide/custom_language_support.md
+++ b/reference_guide/custom_language_support.md
@@ -1,7 +1,7 @@
 ---
 title: Custom Language Support
 ---
-
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 *IntelliJ Platform* is a powerful platform for building development tools targeting *any* language.
 Most of IDE features consist of language-independent and language-specific parts, and you can support a particular feature for your language with a small amount of effort:
diff --git a/reference_guide/custom_language_support/additional_minor_features.md b/reference_guide/custom_language_support/additional_minor_features.md
index 085154189..6e26f6490 100644
--- a/reference_guide/custom_language_support/additional_minor_features.md
+++ b/reference_guide/custom_language_support/additional_minor_features.md
@@ -1,6 +1,7 @@
 ---
 title: Additional Minor Features
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 A number of minor features are listed in the following format:
 
diff --git a/reference_guide/custom_language_support/code_completion.md b/reference_guide/custom_language_support/code_completion.md
index cd7a239a0..218934cf2 100644
--- a/reference_guide/custom_language_support/code_completion.md
+++ b/reference_guide/custom_language_support/code_completion.md
@@ -1,6 +1,7 @@
 ---
 title: Code Completion
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 There are two main types of code completion that can be provided by custom language plugins: reference completion and contributor-based completion.
 
diff --git a/reference_guide/custom_language_support/code_formatting.md b/reference_guide/custom_language_support/code_formatting.md
index 00d264895..255ff6c5b 100644
--- a/reference_guide/custom_language_support/code_formatting.md
+++ b/reference_guide/custom_language_support/code_formatting.md
@@ -1,6 +1,7 @@
 ---
 title: Code Formatter
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 The IntelliJ Platform includes a powerful framework for implementing custom language formatters.
 In this framework, the plugin specifies the *constraints* on the spacing between different syntax elements, and the formatting engine, provided by the IDE, calculates the smallest number of whitespace modifications that need to be performed on the file to make it match the constraints.
diff --git a/reference_guide/custom_language_support/code_inspections_and_intentions.md b/reference_guide/custom_language_support/code_inspections_and_intentions.md
index 4ac8e9b17..54118ef3a 100644
--- a/reference_guide/custom_language_support/code_inspections_and_intentions.md
+++ b/reference_guide/custom_language_support/code_inspections_and_intentions.md
@@ -1,6 +1,7 @@
 ---
 title: Code Inspections and Intentions
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 ### Inspections
 
diff --git a/reference_guide/custom_language_support/documentation.md b/reference_guide/custom_language_support/documentation.md
index 697284232..68b1bfe65 100644
--- a/reference_guide/custom_language_support/documentation.md
+++ b/reference_guide/custom_language_support/documentation.md
@@ -1,6 +1,7 @@
 ---
 title: Documentation
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 To provide different kinds of documentation support (tooltips on **Ctrl-hover**, quick documentation popup etc.), the plugin needs to provide an implementation of the
 [`DocumentationProvider`](upsource:///platform/analysis-api/src/com/intellij/lang/documentation/DocumentationProvider.java)
diff --git a/reference_guide/custom_language_support/find_usages.md b/reference_guide/custom_language_support/find_usages.md
index e0578fc0d..713dbffc0 100644
--- a/reference_guide/custom_language_support/find_usages.md
+++ b/reference_guide/custom_language_support/find_usages.md
@@ -1,6 +1,7 @@
 ---
 title: Find Usages
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 The _Find Usages_ action is a multi-step process, and each step of the process requires involvement from the custom language plugin.
 
diff --git a/reference_guide/custom_language_support/go_to_class_and_go_to_symbol.md b/reference_guide/custom_language_support/go_to_class_and_go_to_symbol.md
index 6567262e0..9f72cec9f 100644
--- a/reference_guide/custom_language_support/go_to_class_and_go_to_symbol.md
+++ b/reference_guide/custom_language_support/go_to_class_and_go_to_symbol.md
@@ -1,6 +1,7 @@
 ---
 title: Go to Class and Go to Symbol
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 A custom language plugin can provide its own items to be included in the lists shown when the user chooses the _Navigate | Class_ or _Navigate | Symbol_ action.
 In order to do so, the plugin must provide implementations for the
diff --git a/reference_guide/custom_language_support/implementing_lexer.md b/reference_guide/custom_language_support/implementing_lexer.md
index cea2dc73e..79e840a5f 100644
--- a/reference_guide/custom_language_support/implementing_lexer.md
+++ b/reference_guide/custom_language_support/implementing_lexer.md
@@ -1,6 +1,7 @@
 ---
 title: Implementing Lexer
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 The lexer, or
 [lexical analyzer](https://en.wikipedia.org/wiki/Lexical_analysis),
diff --git a/reference_guide/custom_language_support/implementing_parser_and_psi.md b/reference_guide/custom_language_support/implementing_parser_and_psi.md
index 4574a5d2a..2ed969b31 100644
--- a/reference_guide/custom_language_support/implementing_parser_and_psi.md
+++ b/reference_guide/custom_language_support/implementing_parser_and_psi.md
@@ -1,6 +1,7 @@
 ---
 title: Implementing a Parser and PSI
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 Parsing files in IntelliJ Platform is a two-step process.
 First, an abstract syntax tree (AST) is built, defining the structure of the program.
diff --git a/reference_guide/custom_language_support/references_and_resolve.md b/reference_guide/custom_language_support/references_and_resolve.md
index c04373627..b26f85652 100644
--- a/reference_guide/custom_language_support/references_and_resolve.md
+++ b/reference_guide/custom_language_support/references_and_resolve.md
@@ -1,6 +1,7 @@
 ---
 title: References and Resolve
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 One of the most important and tricky parts in implementing a custom language PSI is resolving references.
 Resolving references gives users the ability to navigate from a PSI element usage (accessing a variable, calling a method and so on) to the declaration of that element (the variable's definition, a method declaration and so on).
diff --git a/reference_guide/custom_language_support/registering_file_type.md b/reference_guide/custom_language_support/registering_file_type.md
index 59a3fac2f..a3508c6b3 100644
--- a/reference_guide/custom_language_support/registering_file_type.md
+++ b/reference_guide/custom_language_support/registering_file_type.md
@@ -1,6 +1,7 @@
 ---
 title: Registering a File Type
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 The first step in developing a custom language plugin is registering a file type associated with the language.
 The IDE normally determines the type of a file by looking at its file name.
diff --git a/reference_guide/custom_language_support/rename_refactoring.md b/reference_guide/custom_language_support/rename_refactoring.md
index 10065b575..c0d3e68f4 100644
--- a/reference_guide/custom_language_support/rename_refactoring.md
+++ b/reference_guide/custom_language_support/rename_refactoring.md
@@ -1,7 +1,7 @@
 ---
 title: Rename Refactoring
 ---
-
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 The operation of the Rename refactoring is quite similar to that of Find Usages.
 It uses the same rules for locating the element to be renamed, and the same index of words for locating the files which may have references to the element being renamed.
diff --git a/reference_guide/custom_language_support/safe_delete_refactoring.md b/reference_guide/custom_language_support/safe_delete_refactoring.md
index 67a2d5f86..a1f44b8d6 100644
--- a/reference_guide/custom_language_support/safe_delete_refactoring.md
+++ b/reference_guide/custom_language_support/safe_delete_refactoring.md
@@ -1,7 +1,7 @@
 ---
 title: Safe Delete Refactoring
 ---
-
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 The _Safe Delete_ refactoring also builds on the same [Find Usages](find_usages.md) framework as [Rename Refactoring](rename_refactoring.md).
 
diff --git a/reference_guide/custom_language_support/structure_view.md b/reference_guide/custom_language_support/structure_view.md
index 464ab2e9b..ca86d189d 100644
--- a/reference_guide/custom_language_support/structure_view.md
+++ b/reference_guide/custom_language_support/structure_view.md
@@ -1,6 +1,7 @@
 ---
 title: Structure View
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 The Structure View implementation used for a specific file type can be customized on many levels.
 If a custom language plugin provides an implementation of the
diff --git a/reference_guide/custom_language_support/surround_with.md b/reference_guide/custom_language_support/surround_with.md
index ae5afdb04..6ec6f1178 100644
--- a/reference_guide/custom_language_support/surround_with.md
+++ b/reference_guide/custom_language_support/surround_with.md
@@ -1,6 +1,7 @@
 ---
 title: Surround With
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 To support the _Surround With_ action, the plugin needs to register one or more implementations of the
 [`SurroundDescriptor`](upsource:///platform/lang-api/src/com/intellij/lang/surroundWith/SurroundDescriptor.java)
diff --git a/reference_guide/custom_language_support/syntax_highlighting_and_error_highlighting.md b/reference_guide/custom_language_support/syntax_highlighting_and_error_highlighting.md
index 3dd902bf6..40e701160 100644
--- a/reference_guide/custom_language_support/syntax_highlighting_and_error_highlighting.md
+++ b/reference_guide/custom_language_support/syntax_highlighting_and_error_highlighting.md
@@ -1,6 +1,7 @@
 ---
 title: Syntax Highlighting and Error Highlighting
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 The class used to specify how a particular range of text should be highlighted is called
 [`TextAttributesKey`](upsource:///platform/core-api/src/com/intellij/openapi/editor/colors/TextAttributesKey.java).
diff --git a/reference_guide/editors.md b/reference_guide/editors.md
index fad71a9f3..3fba5dfdf 100644
--- a/reference_guide/editors.md
+++ b/reference_guide/editors.md
@@ -1,6 +1,7 @@
 ---
 title: Editors
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 This section covers working with text in the IntelliJ Platform editor. 
 It is presented in two major sections:
diff --git a/reference_guide/frameworks_and_external_apis/external_builder_api.md b/reference_guide/frameworks_and_external_apis/external_builder_api.md
index 30ef3937e..dd91611a4 100644
--- a/reference_guide/frameworks_and_external_apis/external_builder_api.md
+++ b/reference_guide/frameworks_and_external_apis/external_builder_api.md
@@ -1,6 +1,7 @@
 ---
 title: External Builder API and Plugins
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 ### External Build Process Workflow
 
diff --git a/reference_guide/frameworks_and_external_apis/external_system_integration.md b/reference_guide/frameworks_and_external_apis/external_system_integration.md
index a06bc47db..45181ea9f 100644
--- a/reference_guide/frameworks_and_external_apis/external_system_integration.md
+++ b/reference_guide/frameworks_and_external_apis/external_system_integration.md
@@ -1,6 +1,7 @@
 ---
 title: External System Integration
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 # Purpose
 
diff --git a/reference_guide/frameworks_and_external_apis/spring_api.md b/reference_guide/frameworks_and_external_apis/spring_api.md
index e5dfb26cf..f1df0231e 100644
--- a/reference_guide/frameworks_and_external_apis/spring_api.md
+++ b/reference_guide/frameworks_and_external_apis/spring_api.md
@@ -1,6 +1,7 @@
 ---
 title: Spring API
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 Spring API allows 3rd party plugins to re-use, integrate with or extend existing Spring Framework support in IntelliJ IDEA.
 
diff --git a/reference_guide/frameworks_and_external_apis/xml_dom_api.md b/reference_guide/frameworks_and_external_apis/xml_dom_api.md
index 98be59263..61ccc7d6d 100644
--- a/reference_guide/frameworks_and_external_apis/xml_dom_api.md
+++ b/reference_guide/frameworks_and_external_apis/xml_dom_api.md
@@ -1,7 +1,7 @@
 ---
 title: XML DOM API
 ---
-
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 <!-- TODO content: DOM <=> PSI, Go To Symbol, editor gutter icon->DOM -->
 
diff --git a/reference_guide/intellij_artifacts.md b/reference_guide/intellij_artifacts.md
index 30a924a2b..15b73ebec 100644
--- a/reference_guide/intellij_artifacts.md
+++ b/reference_guide/intellij_artifacts.md
@@ -1,6 +1,7 @@
 ---
 title: IntelliJ Platform Artifacts Repositories
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 > **WARNING** When using additional repositories, make sure to use HTTPS always.
 
diff --git a/reference_guide/internal_actions/enabling_internal.md b/reference_guide/internal_actions/enabling_internal.md
index 24dbcae27..318e19aca 100644
--- a/reference_guide/internal_actions/enabling_internal.md
+++ b/reference_guide/internal_actions/enabling_internal.md
@@ -1,6 +1,7 @@
 ---
 title: Enabling Internal Mode
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 There are useful tools, such as the Internal Actions menu, that are only visible if internal mode is enabled in IntelliJ IDEA.
 
diff --git a/reference_guide/internal_actions/interal_actions_menu.md b/reference_guide/internal_actions/interal_actions_menu.md
index 8325ecdfa..d23f78fa4 100644
--- a/reference_guide/internal_actions/interal_actions_menu.md
+++ b/reference_guide/internal_actions/interal_actions_menu.md
@@ -1,6 +1,7 @@
 ---
 title: Internal Actions Menu
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 The Internal Actions menu provides JetBrains IDE plugin developers with a suite of tools to help develop, debug, and test their IntelliJ Platform project.
 
diff --git a/reference_guide/internal_actions/internal_actions_intro.md b/reference_guide/internal_actions/internal_actions_intro.md
index 8f51a837d..a0d82261b 100644
--- a/reference_guide/internal_actions/internal_actions_intro.md
+++ b/reference_guide/internal_actions/internal_actions_intro.md
@@ -1,6 +1,7 @@
 ---
 title: Internal Actions Menu
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 The Internal Actions menu provides JetBrains IDE plugin developers with a suite of tools to help develop, debug, and test their IntelliJ Platform project.
 
diff --git a/reference_guide/internal_actions/internal_ui_lafd.md b/reference_guide/internal_actions/internal_ui_lafd.md
index 92f2df445..b5dd6223a 100644
--- a/reference_guide/internal_actions/internal_ui_lafd.md
+++ b/reference_guide/internal_actions/internal_ui_lafd.md
@@ -1,6 +1,7 @@
 ---
 title: Internal Actions - LaF Defaults
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 The _LaF Defaults_ window provides a key-value pair lookup for UI Controls.
 It also allows interactive prototyping of UI Control color changes. 
diff --git a/reference_guide/internal_actions/internal_ui_sub.md b/reference_guide/internal_actions/internal_ui_sub.md
index 40b8fdf08..5f5b766bd 100644
--- a/reference_guide/internal_actions/internal_ui_sub.md
+++ b/reference_guide/internal_actions/internal_ui_sub.md
@@ -1,6 +1,7 @@
 ---
 title: Internal Actions - UI Submenu
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 The Internal Actions UI submenu provides IntelliJ Platform plugin developers with a suite of tools to help develop, debug, and test their IntelliJ Platform project UI.
 
diff --git a/reference_guide/internal_actions/internal_uii.md b/reference_guide/internal_actions/internal_uii.md
index e6c11053e..4eba4303e 100644
--- a/reference_guide/internal_actions/internal_uii.md
+++ b/reference_guide/internal_actions/internal_uii.md
@@ -1,6 +1,7 @@
 ---
 title: Internal Actions - UI Inspector
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 The _UI Inspector_ is a tool to interrogate elements of the IntelliJ IDEA UI to get an internal description of each element.
 UI elements can be tested interactively by clicking on the element while the _UI Inspector_ is enabled.
diff --git a/reference_guide/localization_guide.md b/reference_guide/localization_guide.md
index b6cd0044d..1eb11b0c3 100644
--- a/reference_guide/localization_guide.md
+++ b/reference_guide/localization_guide.md
@@ -1,7 +1,7 @@
 ---
 title: Localization Guide
 ---
-
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 The purpose of the document is to describe steps necessary to create localized versions of IDEA.
 
diff --git a/reference_guide/messaging_infrastructure.md b/reference_guide/messaging_infrastructure.md
index bcce5b57f..0acede90c 100644
--- a/reference_guide/messaging_infrastructure.md
+++ b/reference_guide/messaging_infrastructure.md
@@ -1,7 +1,7 @@
 ---
 title: Messaging infrastructure
 ---
-
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 # Purpose
 
diff --git a/reference_guide/multiple_carets.md b/reference_guide/multiple_carets.md
index 9b8f51f44..a199794e2 100644
--- a/reference_guide/multiple_carets.md
+++ b/reference_guide/multiple_carets.md
@@ -1,7 +1,7 @@
 ---
 title: Supporting multiple carets
 ---
-
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 ## Introduction
 
diff --git a/reference_guide/performance/performance.md b/reference_guide/performance/performance.md
index 7ec48a7d7..0bc117f5a 100644
--- a/reference_guide/performance/performance.md
+++ b/reference_guide/performance/performance.md
@@ -1,6 +1,7 @@
 ---
 title: Optimizing Performance
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 ## Working with PSI efficiently
 
diff --git a/reference_guide/project_model/build_system.md b/reference_guide/project_model/build_system.md
index 1f07ce82a..2a36d545f 100644
--- a/reference_guide/project_model/build_system.md
+++ b/reference_guide/project_model/build_system.md
@@ -1,5 +1,6 @@
 ---
 title: Build System
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 * [External builder API and plugins](/reference_guide/frameworks_and_external_apis/external_builder_api.md)
diff --git a/reference_guide/project_model/facet.md b/reference_guide/project_model/facet.md
index da073aa4b..e0bbc4934 100644
--- a/reference_guide/project_model/facet.md
+++ b/reference_guide/project_model/facet.md
@@ -1,6 +1,7 @@
 ---
 title: Facet
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 A facet represents configuration specific for a particular framework/technology, associated with a module.
 A module can have multiple facets. E.g. Spring Framework specific configuration is stored in a Spring facet.
diff --git a/reference_guide/project_model/library.md b/reference_guide/project_model/library.md
index 1fad85165..8f8983ae0 100644
--- a/reference_guide/project_model/library.md
+++ b/reference_guide/project_model/library.md
@@ -1,6 +1,7 @@
 ---
 title: Library
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 A library is an archive of compiled code (such as JAR files) that modules depend on.
 
diff --git a/reference_guide/project_model/module.md b/reference_guide/project_model/module.md
index 38aa014c0..d5a331017 100644
--- a/reference_guide/project_model/module.md
+++ b/reference_guide/project_model/module.md
@@ -1,6 +1,7 @@
 ---
 title: Module
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 A _module_ is a discrete unit of functionality that can be run, tested, and debugged independently. Modules include such things as source code, build scripts, unit tests, deployment descriptors, etc.
 
diff --git a/reference_guide/project_model/project.md b/reference_guide/project_model/project.md
index 2a0c32f9d..f760a0ee2 100644
--- a/reference_guide/project_model/project.md
+++ b/reference_guide/project_model/project.md
@@ -1,6 +1,7 @@
 ---
 title: Project
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 In the *IntelliJ Platform*, a project encapsulates all the source code, libraries, and build instructions into a single organizational unit. 
 Everything done in the IDE is accomplished within the context of a project. 
diff --git a/reference_guide/project_model/sdk.md b/reference_guide/project_model/sdk.md
index 723ea289b..9539b8f4f 100644
--- a/reference_guide/project_model/sdk.md
+++ b/reference_guide/project_model/sdk.md
@@ -1,6 +1,7 @@
 ---
 title: SDK
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 Every project uses a Software Development Kit (SDK). 
 For Java projects, the SDK is referred to as the JDK (Java Development Kit). 
diff --git a/reference_guide/project_wizard.md b/reference_guide/project_wizard.md
index 40812077b..5d103e06b 100644
--- a/reference_guide/project_wizard.md
+++ b/reference_guide/project_wizard.md
@@ -1,6 +1,7 @@
 ---
 title: Project Wizard. Adding Support for Creating New Project Types.
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 ## Project Wizard
 
diff --git a/reference_guide/tomcat_integration.md b/reference_guide/tomcat_integration.md
index 5bf331859..a52ae3089 100644
--- a/reference_guide/tomcat_integration.md
+++ b/reference_guide/tomcat_integration.md
@@ -1,7 +1,7 @@
 ---
 title: Tomcat Integration
 ---
-
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 The source code of the Tomcat plugin included in IntelliJ IDEA Ultimate is available as a sample for implementing application server integration plugins.
 You can find the code under *lib\src\src_tomcat.zip* in the main IntelliJ IDEA Ultimate distribution.
diff --git a/reference_guide/ui_themes/themes.md b/reference_guide/ui_themes/themes.md
index 73f3161fa..2f3c09e0a 100644
--- a/reference_guide/ui_themes/themes.md
+++ b/reference_guide/ui_themes/themes.md
@@ -1,6 +1,7 @@
 ---
 title: Creating Custom UI Themes
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 Creating a custom UI Theme is a process of choosing a base IDE Theme (_Light_ or _Darcula_,) then changing aspects of the base Theme definition. 
 Custom UI Themes can:
diff --git a/reference_guide/ui_themes/themes_customize.md b/reference_guide/ui_themes/themes_customize.md
index 18edefaa4..14b3b910a 100644
--- a/reference_guide/ui_themes/themes_customize.md
+++ b/reference_guide/ui_themes/themes_customize.md
@@ -1,6 +1,7 @@
 ---
 title: Customizing UI Themes - Icons and UI Controls
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 <style>
   table {
diff --git a/reference_guide/ui_themes/themes_extras.md b/reference_guide/ui_themes/themes_extras.md
index 65d13591a..09a09cb3e 100644
--- a/reference_guide/ui_themes/themes_extras.md
+++ b/reference_guide/ui_themes/themes_extras.md
@@ -1,6 +1,7 @@
 ---
 title: UI Themes - Editor Schemes and Background Images
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 UI Themes can also provide custom color and font settings, as well as custom images for display in the IntelliJ IDEA application window.
  
diff --git a/reference_guide/ui_themes/themes_intro.md b/reference_guide/ui_themes/themes_intro.md
index dbeba16e7..5d9858aab 100644
--- a/reference_guide/ui_themes/themes_intro.md
+++ b/reference_guide/ui_themes/themes_intro.md
@@ -1,6 +1,7 @@
 ---
 title: Custom UI Themes
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 Beginning with the 2019.1 release, custom UI Themes are supported.
 Custom UI Themes give designers control of the appearance of built-in UI elements.
diff --git a/reference_guide/vcs_integration_for_plugins.md b/reference_guide/vcs_integration_for_plugins.md
index 9dd773cbd..eca4c2f6e 100644
--- a/reference_guide/vcs_integration_for_plugins.md
+++ b/reference_guide/vcs_integration_for_plugins.md
@@ -1,8 +1,7 @@
 ---
 title: VCS Integration Plugins
 ---
-
-
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 This page gives an overview of the Version Control Integration API in IntelliJ IDEA 7.0.
 Most of the concepts described here also apply to IntelliJ IDEA 6.0.
diff --git a/reference_guide/work_with_icons_and_images.md b/reference_guide/work_with_icons_and_images.md
index 759e2252a..867fde9fb 100644
--- a/reference_guide/work_with_icons_and_images.md
+++ b/reference_guide/work_with_icons_and_images.md
@@ -1,6 +1,7 @@
 ---
 title: Working with Icons and Images
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 Icons and images are used widely by IntelliJ Platform plugins. Plugins need icons mostly for actions, custom components renderers, tool windows and so on.
 
diff --git a/tutorials/action_system.md b/tutorials/action_system.md
index ab26d90c3..579c94be4 100644
--- a/tutorials/action_system.md
+++ b/tutorials/action_system.md
@@ -1,6 +1,7 @@
 ---
 title: IntelliJ Action System Tutorial
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 This tutorial leads you through a series of steps which show how to create, register, and customize custom actions and action groups. 
 By registering actions, you can add your own menu items, toolbar buttons and keyboard shortcuts to the IntelliJ IDEA user interface. 
diff --git a/tutorials/action_system/grouping_action.md b/tutorials/action_system/grouping_action.md
index f12515473..32291b896 100644
--- a/tutorials/action_system/grouping_action.md
+++ b/tutorials/action_system/grouping_action.md
@@ -1,6 +1,7 @@
 ---
 title: Grouping Actions
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 If an implementation requires several actions, or there are simply too many actions that overload the menu, the actions can be placed into groups.
 This tutorial demonstrates adding an action to an existing group, creating a new action group, and action groups with a variable number of actions.
diff --git a/tutorials/action_system/working_with_custom_actions.md b/tutorials/action_system/working_with_custom_actions.md
index 59c9d8e4a..7a39cc464 100644
--- a/tutorials/action_system/working_with_custom_actions.md
+++ b/tutorials/action_system/working_with_custom_actions.md
@@ -1,6 +1,7 @@
 ---
 title: Creating Actions
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 ## Introduction
 Plugins can add actions to existing IDE menus and toolbars, as well as add new menus and toolbars. 
diff --git a/tutorials/build_system.md b/tutorials/build_system.md
index 3a52aa113..40b5dc510 100644
--- a/tutorials/build_system.md
+++ b/tutorials/build_system.md
@@ -1,6 +1,7 @@
 ---
 title: Building Plugins with Gradle
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 The [gradle-intellij-plugin](https://github.com/JetBrains/gradle-intellij-plugin) Gradle plugin is the recommended solution for building IntelliJ plugins. 
 The plugin takes care of the dependencies of your plugin project - both the base IDE and other plugin dependencies.
diff --git a/tutorials/build_system/deployment.md b/tutorials/build_system/deployment.md
index c3cfb1f25..68368aceb 100644
--- a/tutorials/build_system/deployment.md
+++ b/tutorials/build_system/deployment.md
@@ -1,6 +1,7 @@
 ---
 title: Publishing Plugins with Gradle
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 Once you have configured Gradle support, you can automatically build and deploy your plugin to the [JetBrains Plugin Repository](https://plugins.jetbrains.com). 
 To automatically deploy a plugin, you need to have _already published the plugin to the plugin repository at least once._ 
diff --git a/tutorials/build_system/gradle_guide.md b/tutorials/build_system/gradle_guide.md
index 17da6d8ee..d94bfdcb2 100644
--- a/tutorials/build_system/gradle_guide.md
+++ b/tutorials/build_system/gradle_guide.md
@@ -1,6 +1,7 @@
 ---
 title: Configuring Gradle for IntelliJ Platform Plugins
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 This page serves as a guide to Gradle-based plugin configuration for _IntelliJ Platform_ projects.
 The IntelliJ IDEA Ultimate and Community editions bundle the Gradle and Plugin DevKit plugins to support Gradle-based development. 
diff --git a/tutorials/build_system/prerequisites.md b/tutorials/build_system/prerequisites.md
index 8315067c3..17c8ac519 100644
--- a/tutorials/build_system/prerequisites.md
+++ b/tutorials/build_system/prerequisites.md
@@ -1,6 +1,7 @@
 ---
 title: Getting Started with Gradle
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 Gradle is the preferred solution for creating IntelliJ Platform plugins.
 The IntelliJ IDEA Ultimate and Community editions bundle the necessary plugins to support Gradle-based development.
diff --git a/tutorials/code_inspections.md b/tutorials/code_inspections.md
index ab936949a..ae7d0cb28 100644
--- a/tutorials/code_inspections.md
+++ b/tutorials/code_inspections.md
@@ -1,6 +1,7 @@
 ---
 title: Code Inspections
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 The IntelliJ Platform provides tools designed for static code analysis called _code inspections_, which help the user maintain and clean up code without actually executing it.
 Custom code inspections can be implemented as IntelliJ Platform plugins.
diff --git a/tutorials/code_intentions.md b/tutorials/code_intentions.md
index dffb4dc5e..264cf84d5 100644
--- a/tutorials/code_intentions.md
+++ b/tutorials/code_intentions.md
@@ -1,6 +1,7 @@
 ---
 title: Code Intentions
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 This topic describes the [conditional_operator_intention](https://github.com/JetBrains/intellij-sdk-docs/tree/master/code_samples/conditional_operator_intention), a sample plugin that adds a new [intention action](https://www.jetbrains.com/help/idea/intention-actions.html) to the IntelliJ Platform Intentions list. 
 In addition, the sample plugin contains a JUnit-based test.
diff --git a/tutorials/custom_language_support/annotator.md b/tutorials/custom_language_support/annotator.md
index 75e6960a0..827be974b 100644
--- a/tutorials/custom_language_support/annotator.md
+++ b/tutorials/custom_language_support/annotator.md
@@ -1,6 +1,7 @@
 ---
 title: 7. Annotator
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 An [Annotator](/reference_guide/custom_language_support/syntax_highlighting_and_error_highlighting.md#annotator) helps highlight and annotate any code based on specific rules.
 This section adds annotation functionality to support the Simple Language in the context of Java code.
diff --git a/tutorials/custom_language_support/code_style_settings.md b/tutorials/custom_language_support/code_style_settings.md
index a0cc6db52..2c734bc81 100644
--- a/tutorials/custom_language_support/code_style_settings.md
+++ b/tutorials/custom_language_support/code_style_settings.md
@@ -1,6 +1,7 @@
 ---
 title: 16. Code Style Setting
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 [Code style settings](/reference_guide/custom_language_support/code_formatting.md#code-style-settings) enable defining formatting options. 
 A code style settings provider creates an instance of the settings and also creates an options page in settings/preferences. 
diff --git a/tutorials/custom_language_support/commenter.md b/tutorials/custom_language_support/commenter.md
index 5ab92e651..252c7576c 100644
--- a/tutorials/custom_language_support/commenter.md
+++ b/tutorials/custom_language_support/commenter.md
@@ -1,6 +1,7 @@
 ---
 title: 17. Commenter
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 A commenter enables the user to comment-out a line of code at the cursor or selected code automatically.
 The [`Commenter`](upsource:///platform/core-api/src/com/intellij/lang/Commenter.java) defines support for "Comment with Line Comment" and "Comment with Block Comment" actions. 
diff --git a/tutorials/custom_language_support/completion_contributor.md b/tutorials/custom_language_support/completion_contributor.md
index 33cd529aa..ddc23979d 100644
--- a/tutorials/custom_language_support/completion_contributor.md
+++ b/tutorials/custom_language_support/completion_contributor.md
@@ -1,6 +1,7 @@
 ---
 title: 9. Completion Contributor
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 Custom languages provide code completion using one of [two approaches](/reference_guide/custom_language_support/code_completion.md).
 The Simple Language plugin implements the less complex of the two methods, reference completion.
diff --git a/tutorials/custom_language_support/find_usages_provider.md b/tutorials/custom_language_support/find_usages_provider.md
index 6d2123220..828448ddd 100644
--- a/tutorials/custom_language_support/find_usages_provider.md
+++ b/tutorials/custom_language_support/find_usages_provider.md
@@ -1,6 +1,7 @@
 ---
 title: 11. Find Usages Provider
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 A [find usage provider](/reference_guide/custom_language_support/find_usages.md) uses a word scanner to build an index of words in every file.
 A scanner breaks the text into words and defines the context for each word.
diff --git a/tutorials/custom_language_support/folding_builder.md b/tutorials/custom_language_support/folding_builder.md
index 521557f99..326ef4aea 100644
--- a/tutorials/custom_language_support/folding_builder.md
+++ b/tutorials/custom_language_support/folding_builder.md
@@ -1,6 +1,7 @@
 ---
 title: 12. Folding Builder
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 A folding builder identifies the folding regions in the code.
 In this step of the tutorial, the folding builder is used to identify folding regions and replace the regions with specific text.
diff --git a/tutorials/custom_language_support/formatter.md b/tutorials/custom_language_support/formatter.md
index 1d889ebea..6fd70c1a8 100644
--- a/tutorials/custom_language_support/formatter.md
+++ b/tutorials/custom_language_support/formatter.md
@@ -1,6 +1,7 @@
 ---
 title: 15. Formatter
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 The IntelliJ Platform includes a powerful framework for implementing formatting for custom languages.
 A [formatter](/reference_guide/custom_language_support/code_formatting.md) enables reformatting code automatically based on code style settings.
diff --git a/tutorials/custom_language_support/go_to_symbol_contributor.md b/tutorials/custom_language_support/go_to_symbol_contributor.md
index d5e6f2836..97a753203 100644
--- a/tutorials/custom_language_support/go_to_symbol_contributor.md
+++ b/tutorials/custom_language_support/go_to_symbol_contributor.md
@@ -1,6 +1,7 @@
 ---
 title: 13. Go To Symbol Contributor
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 A _Go to Symbol Contributor_ helps the user to navigate to any PSI element by its name.
 
diff --git a/tutorials/custom_language_support/grammar_and_parser.md b/tutorials/custom_language_support/grammar_and_parser.md
index ece28ca35..99e0a765b 100644
--- a/tutorials/custom_language_support/grammar_and_parser.md
+++ b/tutorials/custom_language_support/grammar_and_parser.md
@@ -1,6 +1,7 @@
 ---
 title: 3. Grammar and Parser
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 In order for the IntelliJ Platform to parse a Simple Language file, [tokens and elements](/reference_guide/custom_language_support/implementing_parser_and_psi.md) must be defined based on [`IElementType`](upsource:///platform/core-api/src/com/intellij/psi/tree/IElementType.java). 
 The Simple Language grammar must also be defined to generate a parser.
diff --git a/tutorials/custom_language_support/language_and_filetype.md b/tutorials/custom_language_support/language_and_filetype.md
index 3474e6a0b..b423ad6e0 100644
--- a/tutorials/custom_language_support/language_and_filetype.md
+++ b/tutorials/custom_language_support/language_and_filetype.md
@@ -1,6 +1,7 @@
 ---
 title: 2. Language and File Type
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 The IntelliJ Platform [determines file type](/reference_guide/custom_language_support/registering_file_type.md) by examining the name of a file.
 Each language has [Language](upsource:///platform/core-api/src/com/intellij/lang/Language.java) and [LanguageFileType](upsource:///platform/core-api/src/com/intellij/openapi/fileTypes/LanguageFileType.java) objects defining the language.
diff --git a/tutorials/custom_language_support/lexer_and_parser_definition.md b/tutorials/custom_language_support/lexer_and_parser_definition.md
index 561416f33..1d6c8b23a 100644
--- a/tutorials/custom_language_support/lexer_and_parser_definition.md
+++ b/tutorials/custom_language_support/lexer_and_parser_definition.md
@@ -1,6 +1,7 @@
 ---
 title: 4. Lexer and Parser Definition
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 The lexical analyzer defines how the [contents of a file are broken into tokens](/reference_guide/custom_language_support/implementing_lexer.md), which is the basis for supporting custom language features.
 The easiest way to create a lexer is to use [JFlex](https://jflex.de/)
diff --git a/tutorials/custom_language_support/line_marker_provider.md b/tutorials/custom_language_support/line_marker_provider.md
index 5289bbc66..e9705bee2 100644
--- a/tutorials/custom_language_support/line_marker_provider.md
+++ b/tutorials/custom_language_support/line_marker_provider.md
@@ -1,6 +1,7 @@
 ---
 title: 8. Line Marker Provider
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 Line markers help annotate code with icons on the gutter.
 These markers can provide navigation targets to related code.
diff --git a/tutorials/custom_language_support/prerequisites.md b/tutorials/custom_language_support/prerequisites.md
index 28065ad02..fdc544e6e 100644
--- a/tutorials/custom_language_support/prerequisites.md
+++ b/tutorials/custom_language_support/prerequisites.md
@@ -1,6 +1,7 @@
 ---
 title: 1. Prerequisites
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 ### 1.1. Download and Install IntelliJ IDEA
 Download and install either IntelliJ IDEA Ultimate or IntelliJ IDEA Community Edition as described on the [Creating Your First Plugin](/basics/getting_started.md) page.
diff --git a/tutorials/custom_language_support/psi_helper_and_utilities.md b/tutorials/custom_language_support/psi_helper_and_utilities.md
index 63547ec1d..ff3bba9b4 100644
--- a/tutorials/custom_language_support/psi_helper_and_utilities.md
+++ b/tutorials/custom_language_support/psi_helper_and_utilities.md
@@ -1,6 +1,7 @@
 ---
 title: 6. PSI Helpers and Utilities
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 Helper classes and utilities can be embedded in the code generated by Grammar-Kit.
 
diff --git a/tutorials/custom_language_support/quick_fix.md b/tutorials/custom_language_support/quick_fix.md
index df01e6b69..f097516f0 100644
--- a/tutorials/custom_language_support/quick_fix.md
+++ b/tutorials/custom_language_support/quick_fix.md
@@ -1,6 +1,7 @@
 ---
 title: 18. Quick Fix
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 A quick fix for a custom language supports the IntelliJ Platform-based IDE feature [Intention Actions](https://www.jetbrains.com/help/idea/intention-actions.html#apply-intention-actions). 
 For the Simple Language, this tutorial adds a quick fix that helps to define an unresolved property from its usage.
diff --git a/tutorials/custom_language_support/reference_contributor.md b/tutorials/custom_language_support/reference_contributor.md
index ac2c8bea6..61ab2ee86 100644
--- a/tutorials/custom_language_support/reference_contributor.md
+++ b/tutorials/custom_language_support/reference_contributor.md
@@ -1,6 +1,7 @@
 ---
 title: 10. Reference Contributor
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 The [References functionality](/reference_guide/custom_language_support/references_and_resolve.md) is one of the most important parts in the implementation of custom language support.
 Resolving references means the ability to go from the usage of an element to its declaration, completion, rename refactoring, find usages, etc.
diff --git a/tutorials/custom_language_support/structure_view_factory.md b/tutorials/custom_language_support/structure_view_factory.md
index d691ffad7..ccb48a04b 100644
--- a/tutorials/custom_language_support/structure_view_factory.md
+++ b/tutorials/custom_language_support/structure_view_factory.md
@@ -1,6 +1,7 @@
 ---
 title: 14. Structure View Factory
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 The [structure view](/reference_guide/custom_language_support/structure_view.md) in the IntelliJ Platform-based IDE can be customized for a specific file type, including Simple Language.
 Creating a structure view factory allows showing the structure of any file in a **Structure** Tool Window for easy navigation between items.
diff --git a/tutorials/custom_language_support/syntax_highlighter_and_color_settings_page.md b/tutorials/custom_language_support/syntax_highlighter_and_color_settings_page.md
index d673f5858..516cfdea6 100644
--- a/tutorials/custom_language_support/syntax_highlighter_and_color_settings_page.md
+++ b/tutorials/custom_language_support/syntax_highlighter_and_color_settings_page.md
@@ -1,6 +1,7 @@
 ---
 title: 5. Syntax Highlighter and Color Settings Page
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 The first level of [syntax highlighting](/reference_guide/custom_language_support/syntax_highlighting_and_error_highlighting.md#lexer) is based on the lexer output, and is provided by `SyntaxHighlighter`.
 A plugin can also define [color settings](/reference_guide/custom_language_support/syntax_highlighting_and_error_highlighting.md#color-settings) based on `ColorSettingPage` so the user can configure highlight colors.
diff --git a/tutorials/custom_language_support_tutorial.md b/tutorials/custom_language_support_tutorial.md
index cdc83e89e..7818256e4 100644
--- a/tutorials/custom_language_support_tutorial.md
+++ b/tutorials/custom_language_support_tutorial.md
@@ -1,6 +1,7 @@
 ---
 title: Custom Language Support Tutorial
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 In this tutorial we will add support for a [.properties](https://en.wikipedia.org/wiki/.properties) language and its usages within Java code.
 IntelliJ Platform support for custom languages is discussed in more depth in the [Custom Language](/reference_guide/custom_language_support.md) section.
diff --git a/tutorials/editor_basics.md b/tutorials/editor_basics.md
index 99818e37a..cc6d59f21 100644
--- a/tutorials/editor_basics.md
+++ b/tutorials/editor_basics.md
@@ -1,6 +1,7 @@
 ---
 title: Basics of working with the Editor
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 This tutorial will lead you through the series of steps showing how to work with the IntelliJ Platform Editor, how to access and modify text it contains, and how to handle events sent to the editor. 
 * [1. Working With Text](editor_basics/working_with_text.md)
diff --git a/tutorials/editor_basics/coordinates_system.md b/tutorials/editor_basics/coordinates_system.md
index 442b5dcdb..0ac053bbc 100644
--- a/tutorials/editor_basics/coordinates_system.md
+++ b/tutorials/editor_basics/coordinates_system.md
@@ -1,6 +1,7 @@
 ---
 title: Editor Coordinate Systems - Caret Positions and Offsets
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 The previous tutorial [Working with Text](working_with_text.md) demonstrated how to use actions to access a caret placed in a document open in an editor. 
 The examples replaced selected text in a document by using information about the caret.
diff --git a/tutorials/editor_basics/editor_events.md b/tutorials/editor_basics/editor_events.md
index 0a573889b..816fb3aa3 100644
--- a/tutorials/editor_basics/editor_events.md
+++ b/tutorials/editor_basics/editor_events.md
@@ -1,6 +1,7 @@
 ---
 title: 3. Handling Editor Events
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 The previous tutorial [Editor Coordinate Systems](coordinates_system.md) described working with caret coordinate systems in an editor window. 
 Caret position was discussed in terms of Logical Position, Visual Position, and Offset. 
diff --git a/tutorials/editor_basics/working_with_text.md b/tutorials/editor_basics/working_with_text.md
index 4d461f6ec..e4520576c 100644
--- a/tutorials/editor_basics/working_with_text.md
+++ b/tutorials/editor_basics/working_with_text.md
@@ -1,6 +1,7 @@
 ---
 title: Working with text
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 This tutorial shows how to use actions to access a caret placed in a document open in an editor. 
 Using information about the caret, replace selected text in a document with a string. 
diff --git a/tutorials/framework.md b/tutorials/framework.md
index ddfe723fb..0972841cb 100644
--- a/tutorials/framework.md
+++ b/tutorials/framework.md
@@ -1,6 +1,7 @@
 ---
 title: Supporting Frameworks
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 The following tutorial shows how to support a custom framework type for a project and make this framework type embedded in a project wizard as a UI component.n
 The examples in this tutorial rely heavily on the [framework_basics](https://github.com/JetBrains/intellij-sdk-docs/tree/master/code_samples/framework_basics) code sample.
diff --git a/tutorials/kotlin.md b/tutorials/kotlin.md
index 0b434cefd..bf5eedf4a 100644
--- a/tutorials/kotlin.md
+++ b/tutorials/kotlin.md
@@ -1,6 +1,7 @@
 ---
 title: Kotlin for Plugin Developers
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 ## 1. Why Kotlin?
 
diff --git a/tutorials/live_templates.md b/tutorials/live_templates.md
index e63ee0cc0..0d1492409 100644
--- a/tutorials/live_templates.md
+++ b/tutorials/live_templates.md
@@ -1,6 +1,7 @@
 ---
 title: Live Templates
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 *Live templates* are customizable rules that allow developers to abbreviate repetitive patterns of text in the editor. When a user types the designated abbreviation followed by a configurable *expansion key* (usually `Tab`), the IDE will transform the preceding input sequence to its full-length output, and update the cursor position. For example, consider a `for` loop. Typically, the end user would need to type `for(int i = 0; i < 10; i++) {<Enter><Tab><Enter><Enter>}<Up>`. This pattern may be shortened to `fori<Tab>` and the remaining contents will be expanded, leaving the following structure:
 
diff --git a/tutorials/live_templates/template_support.md b/tutorials/live_templates/template_support.md
index 21937a6c6..211b50180 100644
--- a/tutorials/live_templates/template_support.md
+++ b/tutorials/live_templates/template_support.md
@@ -1,6 +1,7 @@
 ---
 title: 1. Adding Live Template Support
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 ## Template Creation
 
diff --git a/tutorials/project_wizard.md b/tutorials/project_wizard.md
index 339337b76..f7eed4c9a 100644
--- a/tutorials/project_wizard.md
+++ b/tutorials/project_wizard.md
@@ -1,6 +1,7 @@
 ---
 title: Project Wizard
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 This set of tutorials shows how to manipulate the process of project creation.
 Configuring Project Wizard automatically allows you to do the following:
diff --git a/tutorials/project_wizard/adding_new_steps.md b/tutorials/project_wizard/adding_new_steps.md
index da6805bb3..b583e6616 100644
--- a/tutorials/project_wizard/adding_new_steps.md
+++ b/tutorials/project_wizard/adding_new_steps.md
@@ -1,6 +1,7 @@
 ---
 title: Adding New Steps to Project Wizard
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 This tutorial shows how to add an extra step to the Project Wizard to provide additional project configuration settings.
 
diff --git a/tutorials/project_wizard/module_types.md b/tutorials/project_wizard/module_types.md
index 3d35a0197..59d07d873 100644
--- a/tutorials/project_wizard/module_types.md
+++ b/tutorials/project_wizard/module_types.md
@@ -1,6 +1,7 @@
 ---
 title: Supporting Module Types
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 *IntelliJ Platform* provides a set of standard module types. However, an application might need a  module of a type that isn't supported yet.
 This tutorial shows how to register a new module type and link it to the project creation procedure and the UI.
diff --git a/tutorials/run_configurations.md b/tutorials/run_configurations.md
index 02bbb8c27..14a58ff65 100644
--- a/tutorials/run_configurations.md
+++ b/tutorials/run_configurations.md
@@ -1,7 +1,7 @@
 ---
 title: Run Configurations
 ---
-
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 These series of steps show how to register and implement a simple Run Configuration.
 Run Configurations are used to run internal and external processes from within *IntelliJ Platform* based products.
diff --git a/tutorials/tree_structure_view.md b/tutorials/tree_structure_view.md
index a17e2916d..c6622f246 100644
--- a/tutorials/tree_structure_view.md
+++ b/tutorials/tree_structure_view.md
@@ -1,6 +1,7 @@
 ---
 title: Tree Structure View
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 This tutorial is meant to illustrate how the project tree structure view appearance can be modified programmatically. 
 If you need to know more about basic concepts of a project view in IntelliJ-based IDEs, please refer to
diff --git a/tutorials/writing_tests_for_plugins.md b/tutorials/writing_tests_for_plugins.md
index a170244db..d996d911b 100644
--- a/tutorials/writing_tests_for_plugins.md
+++ b/tutorials/writing_tests_for_plugins.md
@@ -1,6 +1,7 @@
 ---
 title: Writing Tests For Plugins
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 > **NOTE** Please see [Testing Plugins](/basics/testing_plugins/testing_plugins.md) for a general introduction.
 
diff --git a/tutorials/writing_tests_for_plugins/annotator_test.md b/tutorials/writing_tests_for_plugins/annotator_test.md
index 7d1630d62..8c6833a61 100644
--- a/tutorials/writing_tests_for_plugins/annotator_test.md
+++ b/tutorials/writing_tests_for_plugins/annotator_test.md
@@ -1,6 +1,7 @@
 ---
 title: 4. Annotator Test
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 This test checks if the Simple Language annotator functionality, implemented in the [Annotator](/tutorials/custom_language_support/annotator.md) section of the Custom Language Support Tutorial, works as expected.
 
diff --git a/tutorials/writing_tests_for_plugins/commenter_test.md b/tutorials/writing_tests_for_plugins/commenter_test.md
index 388fd5e06..aab3f4304 100644
--- a/tutorials/writing_tests_for_plugins/commenter_test.md
+++ b/tutorials/writing_tests_for_plugins/commenter_test.md
@@ -1,6 +1,7 @@
 ---
 title: 9. Commenter Test
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 This test will check if the commenter, implemented in the [Commenter](/tutorials/custom_language_support/commenter.md) section of the Custom Language Support Tutorial, works as expected.
 
diff --git a/tutorials/writing_tests_for_plugins/completion_test.md b/tutorials/writing_tests_for_plugins/completion_test.md
index 1a11f1140..9fe4e58d8 100644
--- a/tutorials/writing_tests_for_plugins/completion_test.md
+++ b/tutorials/writing_tests_for_plugins/completion_test.md
@@ -1,6 +1,7 @@
 ---
 title: 3. Completion Test
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 This test checks if the Simple Language code completion functionality, implemented in the [Reference Contributor](/tutorials/custom_language_support/reference_contributor.md) section of the Custom Language Support Tutorial, works as expected.
 
diff --git a/tutorials/writing_tests_for_plugins/find_usages_test.md b/tutorials/writing_tests_for_plugins/find_usages_test.md
index e7080b56f..dd2d65a09 100644
--- a/tutorials/writing_tests_for_plugins/find_usages_test.md
+++ b/tutorials/writing_tests_for_plugins/find_usages_test.md
@@ -1,6 +1,7 @@
 ---
 title: 8. Find Usages Test
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 This test ensures the find usages provider, implemented in the [Find Usages Provider](/tutorials/custom_language_support/find_usages_provider.md) section of the Custom Language Support Tutorial, works correctly.
 
diff --git a/tutorials/writing_tests_for_plugins/folding_test.md b/tutorials/writing_tests_for_plugins/folding_test.md
index e8261c82f..a74223741 100644
--- a/tutorials/writing_tests_for_plugins/folding_test.md
+++ b/tutorials/writing_tests_for_plugins/folding_test.md
@@ -1,6 +1,7 @@
 ---
 title: 7. Folding Test
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 This test verifies the Simple Language folding builder, implemented in the [Folding Builder](/tutorials/custom_language_support/folding_builder.md) section of the Custom Language Support Tutorial, works as expected.
 
diff --git a/tutorials/writing_tests_for_plugins/formatter_test.md b/tutorials/writing_tests_for_plugins/formatter_test.md
index 8e00a2564..a66b8cea6 100644
--- a/tutorials/writing_tests_for_plugins/formatter_test.md
+++ b/tutorials/writing_tests_for_plugins/formatter_test.md
@@ -1,6 +1,7 @@
 ---
 title: 5. Formatter Test
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 This test checks if the Simple Language formatter, implemented in the [Formatter](/tutorials/custom_language_support/formatter.md) section of the Custom Language Support Tutorial, works as expected.
 
diff --git a/tutorials/writing_tests_for_plugins/parsing_test.md b/tutorials/writing_tests_for_plugins/parsing_test.md
index f962024fc..200ea04a8 100644
--- a/tutorials/writing_tests_for_plugins/parsing_test.md
+++ b/tutorials/writing_tests_for_plugins/parsing_test.md
@@ -1,6 +1,7 @@
 ---
 title: 2. Parsing Test
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 The first test checks if the Simple Language parser, implemented in the [Lexer and Parser Definition](/tutorials/custom_language_support/lexer_and_parser_definition.md) section of the Custom Language Support Tutorial, works as expected.
 
diff --git a/tutorials/writing_tests_for_plugins/reference_test.md b/tutorials/writing_tests_for_plugins/reference_test.md
index 026252d7a..569b4ca35 100644
--- a/tutorials/writing_tests_for_plugins/reference_test.md
+++ b/tutorials/writing_tests_for_plugins/reference_test.md
@@ -1,6 +1,7 @@
 ---
 title: 10. Reference Test
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 This test checks if references functionality, implemented in the [Reference Contributor](/tutorials/custom_language_support/reference_contributor.md) section of the Custom Language Support Tutorial, works as expected.
 
diff --git a/tutorials/writing_tests_for_plugins/rename_test.md b/tutorials/writing_tests_for_plugins/rename_test.md
index 6233c8adb..3086d1402 100644
--- a/tutorials/writing_tests_for_plugins/rename_test.md
+++ b/tutorials/writing_tests_for_plugins/rename_test.md
@@ -1,6 +1,7 @@
 ---
 title: 6. Rename Test
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 This test verifies the Simple Language in-place rename functionality, implemented in the [Reference Contributor](/tutorials/custom_language_support/reference_contributor.md) section of the Custom Language Support Tutorial, works as expected.
 
diff --git a/tutorials/writing_tests_for_plugins/tests_prerequisites.md b/tutorials/writing_tests_for_plugins/tests_prerequisites.md
index 46272ff29..8fdaa20df 100644
--- a/tutorials/writing_tests_for_plugins/tests_prerequisites.md
+++ b/tutorials/writing_tests_for_plugins/tests_prerequisites.md
@@ -1,6 +1,7 @@
 ---
 title: 1. Tests Prerequisites
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 This page discusses the steps to configure a plugin project for creating tests.
 
diff --git a/user_interface_components/dialog_wrapper.md b/user_interface_components/dialog_wrapper.md
index fc354ff4c..54a4de7d6 100644
--- a/user_interface_components/dialog_wrapper.md
+++ b/user_interface_components/dialog_wrapper.md
@@ -1,7 +1,7 @@
 ---
 title: DialogWrapper
 ---
-
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 ## DialogWrapper
 
diff --git a/user_interface_components/editor_components.md b/user_interface_components/editor_components.md
index 2ea1784da..afe90be11 100644
--- a/user_interface_components/editor_components.md
+++ b/user_interface_components/editor_components.md
@@ -1,6 +1,7 @@
 ---
 title: Editor Components
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 ## EditorTextField
 
diff --git a/user_interface_components/file_and_class_choosers.md b/user_interface_components/file_and_class_choosers.md
index e407ac726..5ba54908b 100644
--- a/user_interface_components/file_and_class_choosers.md
+++ b/user_interface_components/file_and_class_choosers.md
@@ -1,6 +1,7 @@
 ---
 title: File and Class Choosers
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 ## File Choosers
 
diff --git a/user_interface_components/kotlin_ui_dsl.md b/user_interface_components/kotlin_ui_dsl.md
index f412e2bc1..2cc2da6fc 100644
--- a/user_interface_components/kotlin_ui_dsl.md
+++ b/user_interface_components/kotlin_ui_dsl.md
@@ -1,6 +1,7 @@
 ---
 title: Kotlin UI DSL
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 > **WARNING** Please note the Kotlin UI DSL is in active development and [breaking changes](../reference_guide/api_changes_list.md) can occur between major releases.
 
diff --git a/user_interface_components/lists_and_trees.md b/user_interface_components/lists_and_trees.md
index 492a81e56..ae555a02d 100644
--- a/user_interface_components/lists_and_trees.md
+++ b/user_interface_components/lists_and_trees.md
@@ -1,7 +1,7 @@
 ---
 title: List and Tree Controls
 ---
-
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 ### JBList and Tree
 
diff --git a/user_interface_components/misc_swing_components.md b/user_interface_components/misc_swing_components.md
index ab94daac9..72577525a 100644
--- a/user_interface_components/misc_swing_components.md
+++ b/user_interface_components/misc_swing_components.md
@@ -1,7 +1,7 @@
 ---
 title: Miscellaneous Swing Components
 ---
-
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 ### Messages
 
diff --git a/user_interface_components/notifications.md b/user_interface_components/notifications.md
index 7ea118464..9b733eb8a 100644
--- a/user_interface_components/notifications.md
+++ b/user_interface_components/notifications.md
@@ -1,7 +1,7 @@
 ---
 title: Notifications
 ---
-
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 ## Notifications
 
diff --git a/user_interface_components/popups.md b/user_interface_components/popups.md
index 575dacecf..6630a4be9 100644
--- a/user_interface_components/popups.md
+++ b/user_interface_components/popups.md
@@ -1,7 +1,7 @@
 ---
 title: Popups
 ---
-
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 ## Popups
 
diff --git a/user_interface_components/tool_windows.md b/user_interface_components/tool_windows.md
index 71b65474e..c2706084a 100644
--- a/user_interface_components/tool_windows.md
+++ b/user_interface_components/tool_windows.md
@@ -1,7 +1,7 @@
 ---
 title: Tool Windows
 ---
-
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 ## Tool Windows
 
diff --git a/user_interface_components/user_interface_components.md b/user_interface_components/user_interface_components.md
index a001c9d8f..d16ecba98 100644
--- a/user_interface_components/user_interface_components.md
+++ b/user_interface_components/user_interface_components.md
@@ -1,7 +1,7 @@
 ---
 title: User Interface Components
 ---
-
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 The IntelliJ Platform includes a large number of custom Swing components. Using those components in your plugins will ensure that your plugin looks and works consistently with the UI of the rest of the IDE, and can often reduce the code size compared to using the default Swing components.
 
diff --git a/welcome.md b/welcome.md
index a0a588e70..f465cb692 100644
--- a/welcome.md
+++ b/welcome.md
@@ -3,6 +3,7 @@ title: IntelliJ Platform SDK
 redirect_from:
   - /index.html
 ---
+<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
 
 [![official JetBrains project](https://jb.gg/badges/official-flat-square.svg)](https://confluence.jetbrains.com/display/ALL/JetBrains+on+GitHub)