Rage introduce a new DRM for used copies

I say DRM, it's not quite drm but anyway id seem to be implimenting a system where if you buy the game used you will miss out on part of the game, albeit side quests of the game so you won't miss out on the actual storyline. I'm not entirely sure how exactly this is going to be enforced maybe through the disc key being used on multiple systems. While it is obviously going to annoy alot of the used gamer community, you have to admit it is a clever rouse on ids part to incentivise you to buy the game new. I for one don't really care one way or another about it as I tend to buy games new anyway albeit (as yes I use that word quite alot) at discounted prices a couple months or so later.