[gus_massa]

There is only one patent office per country and one trademark office per country. (It may be more complicated.) And if you ignore the patent/trademark office in your country, they can call some people with tanks to go to your home and ask nicely to follow the patent/trademark rules. (It may be more complicated.)

And there are rules about how the trademarks/patents from one country applies in other countries. (IIRC you must fill some paperwork in every country, but copyright is similar and easier to extend globally.)

Anyway, everyone can create a new chain of NFT, so the same object can be NFTed in many blockchains. Specially because some NFT implementations don't even ask if you are the creator of the digital object.