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So? Since when has making backups of the copyrighted stuff that you have the right to use been made illegal?

A patch you can undo isn't a backup mechanism, it's data in the patch file when you download it. That's a big copyright risk.

You could design a system that generates undo info while you're patching. But it's easier to make a full backup copy of the original rom, and have no way to actually reverse the patching process.

Employing anti-protection methods to do to has been illegal since 1996 WIPO treaties, and then much more strongly in the 2002 DMCA.

So around 30 years now.

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

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.

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