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I really don't think that Apple give a crap what hardware you, as an individual, run Mac OS X on.
The only scenario where they do care is if somebody tries to commercially resell computers running Mac OS X.
Apple puts restrictions on their license to say "only run this on genuine Apple hardware" because they don't want to open themselves to having to offer support to people attempting to run OS X on non-Apple hardware.
Yes, there are technical hurdles to installing Mac OS X on non-Apple hardware. That's down to the fact that Apple doesn't need to support anything besides the hardware they have manufactured. That's not malice, just practical reality - they're not going to spend thousands of engineering hours to support hardware they've never shipped.
Apple has never bothered to put any kind of technological restrictions on the installation of Mac OS X. There has never been any copy protection or license codes. They are completely aware that Mac owners regularly and routinely "pirate" major updates of OS X. The only thing they have done to tackle this issue is to radically reduce the price of their OS upgrades.
History has clearly shown that Apple will do nothing at all to try to stop individuals from installing Mac OS X on non-Apple hardware.