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Så en printer fra før mitten av 80 tallet kan hvære trygg å bruke, hvem kan ha noe sånt utenom museumer tro...
"In the mid-1980s Xerox pioneered an encoding mechanism for a unique number represented by tiny dots spread over the entire print area"
All the major printer makers have added a secret tracking pattern. If you have a color printer – ink or laser – then your printed pages will have the secret dots added.
Brother, Canon, Dell, Epson, Hewlett-Packard / HP, IBM, Konica / Konica-Minolta, Kyocera, Lanier, Lexmark, NRG, Panasonic, Ricoh, Savin, Toshiba, Xerox.
It appears likely that all recent commercial color laser printers print some kind of forensic tracking codes, not necessarily using yellow dots. The printer tracking patterns don’t officially exist so there’s no switch to turn the tracking pattern off. Aside from a major hack of the printer firmware (definitely NOT recommended).