Warning (Added 2015) Some of the documents that we previously received through FOIA suggested that all major manufacturers of color laser printers entered a secret agreement with governments to ensure that the output of those printers is forensically traceable. Although we still don't know if this...
TU Dresden Article about it. https://tu-dresden.de/ing/informatik/sya/ps/chair/news/geheime-daten-auf-dem-druckpapier-diplominformatiker-der-tu-dresden-entwickeln-verfahren-gegen-druckerueberwachung
It has a link to the App that decodes, what being embedded in the print and anonymize the prints, by scrambling the yellow dot patterns. https://dfd.inf.tu-dresden.de/