You all seem to be making incorrect assumptions, on both sides. Let me try to correct a few things:
1) Not all "contracts" or "licenses" are enforceable, in whole or in part.
2) Using samples creates derivative works based on them, which is an exclusive right given to a copyright holder which he can license out, for the most part, as he sees fit. It is not the same as reading a book. You don't create derivative works by reading the book.
3) On the other hand, VSL is also very much like a hardware syntehsizer. You can certainly resell those, and using them creates derivative works based on the copyrighted samples. The difference is VSL can be copied, and the synth cannot. So to discourage people from buying, copying, and reselling without deleting, reselling is restricted by the license, because the right to make derivative works with the samples (i.e. use them) is nontransferable.
I'm making no final judgement as to whether the policy is legal, just trying to point out all the conflicting factors that go into this question.
1) Not all "contracts" or "licenses" are enforceable, in whole or in part.
2) Using samples creates derivative works based on them, which is an exclusive right given to a copyright holder which he can license out, for the most part, as he sees fit. It is not the same as reading a book. You don't create derivative works by reading the book.
3) On the other hand, VSL is also very much like a hardware syntehsizer. You can certainly resell those, and using them creates derivative works based on the copyrighted samples. The difference is VSL can be copied, and the synth cannot. So to discourage people from buying, copying, and reselling without deleting, reselling is restricted by the license, because the right to make derivative works with the samples (i.e. use them) is nontransferable.
I'm making no final judgement as to whether the policy is legal, just trying to point out all the conflicting factors that go into this question.