You can always have it tied to a psn name or an xbl gamer tag, but people change those all the time. I would prefer they do it how they do with some of the online features (that is, if they go the route of no second hand games) and have you purchase the right to use it, or at least have the original code that came with the game. Or even possibly, how ea games used to do it and you signed up for their online service, that way any console you were on, you signed in to it, then it would recognize that particular disk is tied to you so that you may use it. Just some thoughts.