Million - It kills the need for disc swapping because you only need the disc in there to prove that you own the game, nothing more.
The advantages of installing the game on your HDD:
1) No disc scratching
2) Longer X360 Lifespan (less heat production due to DVD not being used)
3) Faster Load Times
4) No Disc Swapping
The DRM is already there on-disc, which is why it'll be compatible with all current Xbox 360 games. There is copy protection already embedded into the discs and data. It will use the same form of copy protection to prove that you didn't just download the game and trade off the disc as they do now to ensure you didn't just flash the DVD info to a blank DVD.
Back from the dead, I'm afraid.











