Once again I regale this blog with old news, but it's just a function of my brain's information retrieval strategy …
Because of a local promotion that involved handing out money-like pieces of paper, I was telling a colleague about printer watermarking, and whizzed back to google to find the supporting evidence. Here we have it - two nice documents from the EFF – one telling us that colour http://www.eff.org/Privacy/printers/wp.php"printers add watermarks'>http://www.eff.org/Privacy/printers/wp.php"printers add watermarks to your printed output, and one giving you the results of reverse engineering the Xerox dot pattern.
Oh, and money-like pieces of paper … that reminds me of the Deception Dollar and the (occasionally spamvertised, but otherwise beautiful) Dream Dollars