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Wow I just found out that color printers add coded dots onto every page you print so that it can be traced back to where and when it was printed. Umm.... did anyone else know about this https://en.wikipedia.org/wiki/Machine_Identification_Code
en.wikipedia.orgMachine Identification Code - Wikipedia
@moonwater It seems to be only on laser color printers though. I tried to look for the code on b/w prints at university but couldn't find anything...
@phel I don’t think it’s on black and white printers. As far as I know....