Apparently on the PS3, when you purchase a new game, it locks to the first console it was played in, meaning it will only play in that particular console. This is to prevent piracy.
However, this also means you won't be able to rent games, or loan them to your friends. And any preowned games you want to get rid of? You'll just have to pitch em, cuz you can't sell em.
Nope, Sony ain't getting a motherfucking dime from me on this.