OS X Lion (10.7) in fact does implement something similar. http://arstechnica.com/apple/reviews/2011/07/mac-os-x-10-7.ars/9#security http://arstechnica.com/app

OS X Lion (10.7) in fact does implement something similar. http://arstechnica.com/apple/reviews/2011/07/mac-os-x-10-7.ars/9#security http://arstechnica.com/apple/reviews/2011/07/mac-os-x-10-7.a...