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This seems like something that could be confirmed by reverse engineering a printer’s firmware? Surely someone has done that?

• circuit10 1mo ago
  It is confirmed and the algorithm has been reverse engineered, though not by looking at firmware https://w2.eff.org/Privacy/printers/docucolor/ https://w2.eff.org/Privacy/printers/docucolor/ Seems like the algorithm is simple enough that they did it just by looking at some prints
• soco 1mo ago
  No need to reverse engineer, printers are required to do this for decades.
  • orthoxerox 1mo ago
    You'd still need to reverse engineer it to build a better firmware without this anti-feature.
  • bobim 1mo ago
    And the reason why it refuses to print this B&W document when yellow is empty.
• shuwix 1mo ago
  You don't need reverse engineering if it's publicly known fact for 20+ years, telemetry just identifies you. 20 years ago, you would need to find the printer.