What capableweb said is correct. NFTs do not confer any ownership of, rights over, or special access to anything else, real-world out digital. When you buy an NFT of an artwork, you aren't buying the artwork, you are only buying the NFT.
As far as I know, the inventors of NFTs do not claim that they do. But it seems like a lot of people talking about and perhaps buying NFTs don't understand that.