[gametorch]

Tangentially related — sending everyone in a company a slightly different document can help catch the person leaking confidential documents to the press.

[macintux]

https://en.wikipedia.org/wiki/Canary_trap

[me_vinayakakv]

Tyrion did that thing in GoT (fictional btw) - https://www.reddit.com/r/gameofthrones/comments/45256e/s2e3_...

[whatevaa]

Fictional, but based on real approach.

[xanderlewis]

That’s what I thought it was going to be.