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Does Gatekeeper point the way to an App Store-only OS X? - tuaw.com
http://news.google.com/news/url?sa=t&am … only-os-x/
Everything I read about it says there are 3 levels: App Store Only, Signed with an Apple Certificate if from outside the store, or "You're on your own". The default is the second one; Apple will issue free certificates to developers who don't want to use the store and revoke them immediately if there are reports of bad behavior.