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"This guide is part of the Machine Identification Code Technology project. It 
explains how to read the date, time, and printer serial number from forensic 
tracking codes in a Xerox DocuColor color laser printout. This information is 
the result of research by Robert Lee, Seth Schoen, Patrick Murphy, Joel 
Alwen, and Andrew "bunnie" Huang. We acknowledge the assistance of EFF 
supporters who have contributed sample printouts to give us material to 
study. We are still looking for help in this research; we are asking the 
public to submit test sheets or join the printers mailing list to participate 
in our reverse engineering efforts."

www.eff.org/Privacy/printers/docucolor/ (with pics)

Ludi