You can patent damn near anything, whether you've made it or not. I imagine this means that there's quite a few more ED's on the way (always a good thing), and that we'll see fewer knock-offs.
Still, having a patent on a game mechanic is something I don't really agree with. Do US patents expire, anyone?
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"'There's a tendency among the press to attribute the creation of a game to a single person,' says Warren Spector, creator of Thief and Deus Ex."
-- From an IGN game review.
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