---
# Scope:
# * Clarify copyright and license conditions.

category: builds-support
order: 20
---

# License and legal

The following legal notices apply to CKEditor 5 Builds and all software from CKEditor 5 Ecosystem included with it.

Copyright (c) 2003-2021, CKSource Frederico Knabben. All rights reserved.

Licensed under the terms of [GNU General Public License Version 2 or later](http://www.gnu.org/licenses/old-licenses/gpl-2.0.html).

## Free for Open Source

If you are running a project with an OSS license incompatible with GPL, please [contact us](https://ckeditor.com/contact/) and we will be happy to support it with a free CKEditor 5 license.

## Sources of intellectual property included in CKEditor

Where not otherwise indicated, all CKEditor 5 Builds 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](http://cksource.com/) Frederico Knabben. All other brand and product names are trademarks, registered trademarks or service marks of their respective holders.