To be clear, I don't particularly like the marking for printers and copiers. I think if a manufacturers is intentionally adding forensic devices to their products they should reveal it and let the purchaser make up their mind.
That said, I don't think a theoretical ability to track me down necessarily equates to a violation of privacy. To prove I printed a particular piece of paper from my printer would pretty much require already knowing that I printed it. Nobody is going to find a random piece of trash at the landfill and be able to say "Alex Stroup printed this."
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