I don't know, sorry, and our admins don't provide legal advice either. That said, you probably don't need to worry so much. Just state what uses you allow. People who buy your assets will want to know. It doesn't need to be all formal because, frankly, most people just want to be honest. And those who don't? A strongly-worded license isn't going to keep them at bay, and it would be moot anyway unless you could afford to sue. In which case you could also get a lawyer.