Under which licenses do CKEditor 4 and CKEditor 5 come?

• CKEditor 4 is distributed under three copyleft Open Source license options: GPL, LGPL, MPL.
• CKEditor 5 is distributed under a GPL 2+ copyleft Open Source license (if you are running a project with an OSS license incompatible with GPL, please contact us and we will be happy to support it with a free CKEditor 5 license).

If you are working on a SaaS project, creating a commercial application or just need more flexibility, you can purchase a commercial license that allows special license terms and a dedicated support.

As for commercial licensing, CKSource grants both term-based and perpetual licenses depending on the customer software-specific usage scenario and needs.

Please visit the pricing pages of CKEditor 4 and CKEditor 5 for details.