What is the term for the use of varied punctuation and white space in document versions to detect leaks?
example: You get a version of a document, and you don't know which of those has been modified, so you must protect it or you will be instantly found out like, "page 283 in agent x's copy has a coordinating conjunction instead of a semicolon in line 24"
Please please please let me know if you know.
Also, happy birthday to you. You know who you are.
Update:
Canary Trap and Steganogaphy could be what I had in mind. More likely the former.
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