https://www.tomshardware.com/news/eff-decodes-printertrackingdots,1576.html
Electronic Frontier Foundation decodes printer tracking dots | Tom's Hardware
Oct 19, 2005 - The next time you use the office printer, you may be printing up a lot more than sales figures or quarterly reports. Many color laser printers are secretly...
printer tracking dotselectronicfrontierfoundationdecodes
https://www.ibtimes.co.uk/your-printer-spying-you-full-list-manufacturers-who-use-secret-tracking-dots-revealed-1625232
Is your printer spying on you? Full list of manufacturers who use secret 'tracking dots' revealed |...
Jun 7, 2017 - Big name manufacturers who employ invisible yellow dot spy code revealed.