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Re:Tim Cook says employees who leak memos do not belong, acc... by MikeDelta on Wednesday September 22, 2021 @05:58PM (#28622488)
That is called a canary trap.

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

Re:Tim Cook says employees who leak memos do not belong, acc... by perl4ever on Wednesday September 22, 2021 @08:05PM (#28623675)
Regarding the related technique, a "barium meal test", there is an xkcd:

https://xkcd.com/525/