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You have no idea how deep this rabbit hole goes. Search for EFF printers secret tracking.

Virtually all commercial printers embed an invisible identifier on every page printed.

It was about money anti-counterfeiting.

There is always a legit reason. It’s just never the only reason.

Are they still doing the EURion constellation, too? You can embed that in anything.

Now I need to see if agentic reverse engineering of printer firmware can actually remove that "feature" for good.

Virtually all color laser printers and copiers.

Not only USSR.

I wonder whether Arthur Conan Doyle had the idea before the police started using typewriter typeface wear and tear for forensics.

Sure, try to scan, photocopy, edit in photoshop or print US money today.

Or EU money.