Software License Agreement
Copyright (c) 2003-2023, CKSource Holding LTD. All rights reserved.
We are proud to be Open Source.
CKEditor 5
CKEditor 5 is licensed under the terms of GNU General Public License Version 2 or later.
If you are running an Open Source project with an OSS license incompatible with GPL please contact us and we will be happy to support your project with a CKEditor 5 license.
CKEditor 4
CKEditor 4 is licensed under the terms of any of the following licenses at your choice:
- GNU General Public License Version 2 or later.
- GNU Lesser General Public License Version 2.1 or later.
- Mozilla Public License Version 1.1 or later.
Note: As announced in 2018, CKEditor 4 reached its End of Life in June 2023. For those not ready to migrate to CKEditor 5, we offer an Extended Support Model Package that provides protection against security vulnerabilities and third-party API changes. Learn more here.
Sources of Intellectual Property Included in CKEditor
Where not otherwise indicated, all CKEditor content is authored by CKSource engineers and consists of CKSource-owned intellectual property. In some specific instances, CKEditor will incorporate work done by developers outside of CKSource with their express permission.
Trademarks
CKEditor is a trademark of CKSource Holding LTD. All other brand and product names are trademarks, registered trademarks or service marks of their respective holders.