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Not *legally*... although I doubt very much if there would be any practical repercussions. I've upgraded all 4 of my OS X machines with the same install disk through every version of OS X and I've never even got a nasty email from Apple.After I upgrade to 10.1 with the 10.1 upgrade CD, am I free to use 10.0 on a different computer? Or can I not since it's an upgrade?
AFAIK, if the original owner still has 10.0 or 10.1 installed on his computer, then you can't legally install it on yours... at least that's the rule of thumb for used software, you'd have to read the EULA to find out for sure.