@mdma
That is not correct. I can do what the hell I want with the software as long as I don't pirate it. Unless I sign a contract physically when I buy MacOSX that say's I agree not to run it on non-apple hardware then I am bound by no licence at all. This counts for GPL too.
I don't know about the MacOS X license, but the GPL isn't that simple. If you do not accept the GPL license, you have no permission to use the code, and are therefore in breach of copyright law.
Of course, that's the theory and you may claim that you can do otherwise and no one can touch you. We haven't had a test case under UK law (AFAIK) so there's no precedent to go by.