For most open-source and non-commercial projects, CKEditor 5 can be used without additional licensing costs. However, commercial projects that may involve derivative works or require specific agreements for use within proprietary systems should contact CKSource to discuss their needs and negotiate appropriate terms. There's no "license key" to manage in the traditional sense; instead, the focus is on adhering to the GPLv2 license terms or negotiating alternative licensing directly with CKSource.
To help me tailor this guide to your needs, please let me know: ckeditor 5 license key
If you are using the commercial distribution (often installed via npm under the @ckeditor/ckeditor5-* packages) but you have not configured a license key, you will see a warning banner in the editor stating "This is a trial version" or "Unlicensed usage." For most open-source and non-commercial projects, CKEditor 5
If you are running a strictly open-source project, set the key to 'gpl' : javascript To help me tailor this guide to your
Are you building a application or an open-source project?
: Provides unrestricted access to all subscribed features for live end-users. On cloud-hosted plans, these keys track and consume "editor loads". Development License Key