Hi, My dad has an older iMac that he bought Snow Leopard for. He's since purchased Lion and upgraded to that. But we have an old MacBook that we want to sell that is running Leopard and we'd like to use the Snow Leopard for that, but we're not quite sure about the do's and don'ts with the licence given it was originally installed on the other machine. We think it should be ok but we'd like to be sure. Anyone? Thanks in advance.