I have for years told people that every color copy you make is tagged with the serial number of the machine. This was proven to me 7 or 8 years by some engineers. We had 5 color copiers and made copies on each, the engineers walked in took our copies into the other room and returned a few minutes later and placed each copy on the machine from which it was produced.
Well the guys at "EFF" believe thay have cracked the code from Xerox, maybe they have deciphered it who knows.
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