Like with the Rachet ‘n’ Clank Unreal Tutorials series on how to build your own Rachet ‘n’ clank game mechanics for your game which those game mechanics may be protected under patent laws since its a very popular game. Patents protect the game mechanics and ideas in the game so other game developers cannot copy the game mechanics without getting into trouble with these companies, so its not just
Very few companies have patents on game mechanics nowadays, and the majority of those that do, did so back in the 80’s and many of those came about from arcade cabinet games. Patents are expensive and often convoluted to obtain, so most companies reserve their use for consoles and peripherals, rather than mechanics themselves.