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Prolly just a custom cd check, and the exe is SVKP protected so that you cant patch it easily. If you are good at reversing you could manually unpack it, shouldn't be too hard compared to safedisc, and just patch the CD check.
I think other companies used exe protectors before... I think Jowood had a Armadillo/Securom packed exe with custom checks in Chaser, but I can't remember... It was a long time ago...
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