If I purchased a single developer license, how can I prevent my freelance developer from using the license at the end of the project?
I've sent an e-mail reply to your query there on this topic as well, but for completeness - we don't expect to you take any technical steps to stop the developer from using Editor once they have handed the software over to you. Instead, we expect them to bide by the licensing terms, and agreement that they will have with you for the handover.
If someone is going to break those terms, there is very little we can do in technical terms to stop them.
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