Cryptographic licence verification so you can play the game, say for example to use online services. Allows you to trade that licence to other people directly, no third party involvement to facilitate the trade. The game would pick it up and work. Anyone could download the game files but they only work if you own the game either by buying off someone directly or an official publisher
You’re talking about media linked to by existing NFTs. You can’t copy an NFT and use it, you don’t have the cryptographic keys to mint more. There is a finite number.