Please excuse this question, but though my wife is well into her second iMac, I've always been a Windows guy and always wondered about this. I'm well aware that Apples software - the OS X, iLife, and iWork - are available in both single use and 5-machine Family Packs for just a few dollars more. What I've always wondered is just how Apple enforces this without resorting to MS's rather draconian "Activation" scheme? All I can imagine is simply an "Honor" system of Apple trusting its users. Thanks for letting me get this off the back of my mind.