from sci.crypt posted by Jan Panteltje <pNaonStpealmtje@yahoo.com>
under the subject title: Secret dot color code on inkjet prints broken
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The code is put there to trace forgeries etc...
http://www.eff.org/news/#004063

Decode your own Xerox codes.. (with source code cgi program for download).
http://www.eff.org/Privacy/printers/...ex.php#program

With thanks to www.heise.de to point it out.

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Regards,

PS There are a number of links from the posted urls such as:

http://www.eff.org/Privacy/printers/list.php