Stopping Games Being Played Before Release
Using a system update that is released 23:59:59 the day before it is released. The game once in the disk tray will go through what every game does, showing the logo's of producers, designers etc, but the main menu is gone, so the play cannot do anything.
The system update will then cause the main menu to appear. There is the problem for people who don't connect to Xbox Live / PSN thou.
It would stop the leaks.