The Lazy Genius

Security News & Brain Dumps from Xavier Ashe, a Bit9 Client Partner

List of Printers Which Do or Don't Print Tracking Dots

Posted by Xavier Ashe on October 26, 2005

This is a list in progress of color laser printer models that do or
do not print yellow tracking dots on their output.

Remember that a “no” simply means that we couldn't see yellow dots;
it does not prove that there is no forensic watermarking present.
(For example, the HP Color LaserJET 8500 series does not include any
yellow tracking dots that we can see, but it may still include some
kind of forensic marking, since the majority of earlier CLJ models
did.)

Remember that a “yes” simply means that we (or another source, as
noted) saw yellow dots that appeared anomalous to us. Until we
decipher the marking schemes or receive other confirmation, this does
not constitute proof that any particular kind of information is
represented by these dots. In a very few cases, for example, they
might be the result of a poor dithering technique, rather than a
forensic mark.

From the EFF.

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