Game companies maybe have the source code and tooling around. And can maybe get a remaster. Look at titles like Kingdom Hearts 1.5 HD. Square Enix lost the source to KH 1 despite it only being ~12 years old at release and had to rebuild it. Developers close all the time, they get bought and sold and bought and sold and nobody is entirely sure who owns the rights to X title anymore or where the code is. Then you also have licensing rights for cars, sports leagues, music etc.