In fairness, games didn’t start employing encryption on the content till the 7th generation. So unless you’re applying ips patches to a 360 game you’re not breaking any DRM
Playing the title you backed up and patched is a different matter entirely
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Courts have ruled many things besides encryption count as anti-copying measures, and that the laws apply retroactively, so it’s not so clear such patches even on 360 are legal. Try selling such patches and test it.
A patch wouldn't need to even care about encryption, since it's just looking at the raw file data.