Copyright is a law that by design prevents the selling or buying or other transfer of some data, and it even sometimes works (black markets notwithstanding). I

Copyright is a law that by design prevents the selling or buying or other transfer of some data, and it even sometimes works (black markets notwithstanding). If your goal is to restrict the transfer of some other kind of data, copyright is already a legal and practical framework that had tackled the same problems, and offers solutions.