If you use premium features (like real-time collaboration, export to PDF, or AI Assistant) or operate a closed-source commercial application, you must use a paid key provided by CKSource.
Resolving this issue requires adding a single line of code to your CKEditor 5 initialization script. The value you provide depends entirely on your project's legal licensing structure. Option 1: For Open-Source Projects (GPL) ckeditor 5 license key hot
If you are building a single website or a personal project, the is affordable (around $99/year at the time of writing). This gives you one commercial license key for one domain. For that price, you get peace of mind, automatic updates, and official support. If you use premium features (like real-time collaboration,