[Pyrodogg]

It's theoretically possible that the contract could be structured in such a way that "The bearer of this token has rights X, Y, Z over this real or intellectual property", but that's definitely not what is being hyped right now.

More commonly, people are just buying an authenticated digital asset which confers no rights over the source material.

For example, An artist could sell unsigned instances of their digital art as .JPG files, and they could sell authenticated copies as NFT.

In both cases, you get a copy of the art. In neither case are you getting an implicit copyright to the work that would allow you to redistribute the work.