[Scummvm-devel] Detecting patched games

[Pierre-Yves Gérardy]

On Sun, Aug 15, 2010 at 19:33, Max Horn <max at quendi.de> wrote:

>
> Indeed; and this would be even easier than ever before, as they would only
> need to remove that "pirated" flag (resp. the code that checks for it). This
> is IMHO a major drawback of the "include MD5 to be able to notify users
> about piracy" idea.
>

You could store the MD5 hash of the MD5 hash of pirated games, and check:
- against the legitimate MD5 database. Match? => as usual.
- No match? check against the MD5^2 database. Match? => Display a warning.
- Still no match? => Display the "Please send us the hash" message.

-- Pierre-Yves
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