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The EULA language for OS X clearly prohibits the installation on non-Apple branded hardware. In WIPO signatory countries (like the US and Europe), you must accept the EULA terms to obtain a license to use (copy to disk or memory) the software and a license for the patents embodied in the software (codecs, etc.). In other parts of the world, it may not be a copyright violation or a patent violation.
The DMCA would not apply to the Apple software as there are no access controls of any sort in place. There are technical issues to be overcome to use the software, to be certain, but there's no encryption or intentional impediment to prevent access or copying.
I usally let my cat agree to these kind of deals.