diff --git a/sample/ckeditor.js b/sample/ckeditor.js
index cd10ff3a3f75c7799c56e4e12cc09c4b7415b372..4748288a3b3a25d76b1d94cb5a3fc1183ef242f8 100644
--- a/sample/ckeditor.js
+++ b/sample/ckeditor.js
@@ -1,3 +1,26 @@
+/*
+ * Copyright (C) 2022 InidiScale GmbH <info@indiscale.com>
+ * Copyright (C) 2022 Florian Spreckelsen <f.spreckelsen@indiscale.com>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
 import ClassicEditor from '@ckeditor/ckeditor5-editor-classic/src/classiceditor';
 import CKEditorInspector from '@ckeditor/ckeditor5-inspector';
 
diff --git a/src/complexitywiki_plugins.js b/src/complexitywiki_plugins.js
index 09e91e78d26e75efacd4017250ec8aede5f4d1ff..e99c785d60c396b0cae76be3c4ae1a4a94019ff8 100644
--- a/src/complexitywiki_plugins.js
+++ b/src/complexitywiki_plugins.js
@@ -1,3 +1,26 @@
+/*
+ * Copyright (C) 2022 InidiScale GmbH <info@indiscale.com>
+ * Copyright (C) 2022 Florian Spreckelsen <f.spreckelsen@indiscale.com>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
 import {
 	Plugin
 } from 'ckeditor5/src/core';
diff --git a/src/index.js b/src/index.js
index 95360d6b50a25348559bb8b2fbc7d4492632de4d..0aabbc83d8cb2a090e2cfe33f72d77bafdc38e6d 100644
--- a/src/index.js
+++ b/src/index.js
@@ -1 +1,24 @@
+/*
+ * Copyright (C) 2022 InidiScale GmbH <info@indiscale.com>
+ * Copyright (C) 2022 Florian Spreckelsen <f.spreckelsen@indiscale.com>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
 export { default as ComplexitywikiPlugins } from './complexitywiki_plugins';