In reply to:

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Id Software (the Quake people) wouldn't even have to do this -- they could just say they had done it and it might deter piracy: If they printed a warning label on the CD, something like: WARNING: This CD contains a hidden sector that will NOT copy. Copied CDs without this sector will delete executable files in your Windows directory."

Or, they could actually do it (is that technically possible?) but there might be unpleasant legal ramifications.

I would certainly be reluctant to make or use an illicit copy of a CD under those circumstances! (Not that I would in any case... :-)

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There's already plenty of games that use that copy protection... and they couldn't say/delete files in the user directory - but it would probably be bad enough if saved games randomly deleted themselves, and if they DIDN"T tell anyone about that, emm.. feature:)
-mark


...proud to have owned one of the first Mark I units