The artist always retains the copyright to the work, the buyer is simply buying the digital token. (when you choose the private option, we do have a commercial option as well, that's another story)
There are some artists who choose to offer additional things like prints or originals to buyers but that is all done seperate as we can't really enforce that on site.
If you have any questions feel free to join the discord :
Thanks for the clarification. I am seriously considering producing some NFT artworks and will be applying for verification soon. Exciting times for the art world and it seems to be a great fit for Hive.