I believe the copy protection has been removed already in subsequent releases of the game. the latest version of the game being the steam version.
I have been running the steam version because when i replaced my buggered up hard drive i had to reinstall but had recently moved and could not handily find my SHIII Disc.
The steam version runs with GWX just fine, i have also succeeded in using many other mods enabled through JSGME without any problems
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