The way that most OSes work (including OS X) is that you need to own the same number of licenses as you have installs. For example, I have a MBP and an iMac that came with Leopard. Therefore, my OS X Family Pack disk could be installed on those computers, without using up a license. However, I have an iMac G4 that came with Panther, so to install Leopard on it would use up a license. Of course, since OS X doesn't have any sort of DRM, unlike Windows, you don't have to worry about voiding a license key. I have a friend who installed his single-user copy of Leopard on 150 computers. He works for a business, and their site license of OS X had not arrived yet, so he simply used his disk to install on all of the computers. This restriction is only for those of us that want to keep it as legal as possible, but since installing OS X on a non-Apple computer is technically a breach of the terms of service, keeping the number of installs and licenses equal is merely a formality. Most of us here love Apple, hence why we Hackintosh, and would rather not gyp them out of the (quite reasonable) cost of OS X licenses. Does that make sense?