canary trap
   a stratagem used to detect those who abstract, copy, and circulate confidential documents
   A way to catch a canary3 who informs political associates or journalists rather than the authorities:
    What about internal security...the project documents?... You mean canary traps?... You use the machine to make subtle alterations in each copy of important papers. (Clancy, 1988)

How not to say what you mean: A dictionary of euphemisms. . 2014.

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