> It's very likely your printer is secretly adding marks to the page
It's most likely how the FBI caught NSA leaker Reality Winner:
> Both journalists and security experts have suggested that The Intercept's handling of the documents, which included publishing the documents unredacted and including the printer tracking dots, was used to identify Winner as the leaker.
It's most likely how the FBI caught NSA leaker Reality Winner:
> Both journalists and security experts have suggested that The Intercept's handling of the documents, which included publishing the documents unredacted and including the printer tracking dots, was used to identify Winner as the leaker.
https://en.wikipedia.org/wiki/Reality_Winner