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
As announced in 2018, CKEditor 4 reached its End of Life (EOL) in June 2023.
A special edition, CKEditor 4 LTS (Long Term Support), is available under commercial terms (Extended Support Model Package) for anyone looking to extend the coverage of security updates and critical bug fixes. Learn more here or contact us to obtain a commercial license.
CKEditor 4 LTS (Long Term Support, 4.23.0 and above) is available under exclusive terms of the Extended Support Model Package.
CKEditor 4 Open-Source edition (4.22.* and below) is licensed under the terms of any of the following licenses at your choice:
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.