Since OS X is now available on the Mac App Store since Lion, all seems good by the fact you "can user this downloaded copy on all your Macs" and the same works with any app bought, This holds true as long as you don't have a pre-intslled version of OS X. In this instance you are unable to download from the Mac App Store, which is probably why instructions are only you can take it from the Restore Image (haven't tried this), sometimes Apple obviously wouldn't let you do from their standpoint. Since the pre-instlalled copy is tied to the hardware, prevents you from downloading from the Mac App Store (for backup purposes, later reinstallation on new hard drive). Of course, the other way round this would be if you already had a mac with Lion or Mountain Lion (not pre-installed) but downloaded from the App Store, and create a USB flash drive, take it take to the original Mac to install if needed. Does anyone seems its strange that anything downloaded from the STore is Free to use on any Mac.... that is, all BUT the pre-install software ? Furthermore to this, since iPhone, iMovie apps are pre installed, and the user DOES get a downloaded copy, or by restore image, you can basically re-download iPhoto/iMovie/garageband for FREE afterwards if the user needs them.