The EFF made some big news. DocuColor printers hide the date, time, and serial number of the printer in every image they print.
It's not really a surprise that this watermarking exists, but it is a surprise that it's so transparent. Any idiot with a blue lightbulb can read it; no cryptography at all.

The EFF does good work and could use your support.

  2005-10-18 13:02 Z