This is potentially the beginning of a very interesting trend, and something I have spent some time thinking about. My sense is that owning an NFT should allow you to control access to that content (even if your choice is just to make it publicly accessible). NFT doesn't have an ACL layer built in, so this would need to be added (has anyone already done this?)

One open question is whether it actually makes sense to have an ACL for an electronic asset, because once someone has access to it, they can easily make a perfect copy of the bits and give it to anyone they want. But I guess you could make the same argument about selling access to digital content that is available on a torrent somewhere.