Hi @Gábor, thank you very much for your detailed reply. It was very helpful and clarified many important points about SCFLicense and the possibility of using it for a new commercial extension. It is good to know that a new approved developer can use SCFLicense, that the extension does not need to be open-source, and that limited-validity licenses are supported. I still have some more specific questions, so I will contact support@sketchucation.com as you suggested. Thanks again for your support. Best regards, Alessandro