I remember when I was young getting a game from my older sister's college boyfriend. Gave me the game on disks, and also a photocopied manual just for this same purpose. Used to be super common for games to use these kinds of checks for anti piracy. I thought it was super funny though, because the game was pretty old, and I was confused why this guy didn't know how to find a cracked version of the game to avoid having to pull out a 60 page manual just to play.