Forwarded from IWW
TIL that all modern color printers print a secret, nearly invisible code onto every page to allow governments to track the serial number and timestamps:
https://en.m.wikipedia.org/wiki/Machine_Identification_Code
https://en.m.wikipedia.org/wiki/Machine_Identification_Code
Wikipedia
Printer tracking dots
digital watermark which certain color laser printers and copiers leave on every single printed page, allowing to identify the device with which a document was printed and giving clues to the originator