Including a valid licenseKey (either 'GPL' or your commercial string) is required to remove technical limitations or watermarks in newer versions of the editor. If you are using premium plugins like , the editor will specifically look for this key to authenticate the service. License key and activation | CKEditor 5 Documentation
: Commercial license holders can retrieve their specific keys by logging into the CKEditor Ecosystem Dashboard under the "Your Products" section. Configuration ckeditor 5 license key
Premium features require both the feature’s plugin and a valid license key: Including a valid licenseKey (either 'GPL' or your
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