Whilst the old cracks on HD DVD and BlueRay focussed on getting the identifying keys off the media, which meant that if the DVD software was updated, the keys could be changed and the crack wouldn’t work and more (for the cracked item) the next generation of cracks involve taking the Volume Unique Keys off the player hardware (in this case the XBOX 360). This you can’t change using a software update, so that kills AACS a bit more permanently.