p. 2019-08-04; "Government whistleblowers are increasingly being charged under laws such as the Espionage Act, but they aren’t spies." (ib., 2019-08-14)
"Evidence from the Electronic Frontier Foundation is that the encodings are embedded in color printers from all major manufacturers. (...) most manufacturers do nothing to make consumers aware that their printouts can be tracked."
EFF campaign agains printer manufacturers using yellow dots to secretly watermark color prints probably suitable for tracking documents.