Old spy craft thing. Disseminate 12 copies of a doc, each with a very subtle difference. If that doc pops up somewhere it shouldn’t, you know where it came from.
It’s definitely still useful and easier to do now too. SpaceX and Tesla both allegedly use it to catch leakers. It’s usually done now with whitespace and/or invisible characters.
Old spy craft thing. Disseminate 12 copies of a doc, each with a very subtle difference. If that doc pops up somewhere it shouldn’t, you know where it came from.
LOL, probably not so useful in the digital age.
It’s definitely still useful and easier to do now too. SpaceX and Tesla both allegedly use it to catch leakers. It’s usually done now with whitespace and/or invisible characters.