Well if they sell "cd keys" wouldn't you think it would only work once like how most computer programs work where you can only activate the code once or do you think that when trading the game you would have to hand over the key with the game so you can still activate it [b]ex: (The game works on other consoles only if you have the key)[/b]

If the key was transferable there would be little to no point in doing any of this anti used game stuff. The cd key would be tied to your live account and it will only be a one time use but from that point on your account would have access to whatever the locked features were. (think online pass for BF3)