Machine Identification Code: Print Analyze Burn

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https://en.wikipedia.org/wiki/Machine_Identification_Code

A Machine Identification Code (MIC), also known as printer
steganography, yellow dots, tracking dots or secret dots, is a 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. Developed
by Xerox and Canon in the mid-1980s, its existence became public only
in 2004. In 2018, scientists developed privacy software to anonymize
prints in order to support whistleblowers publishing their work.