It is. https://books.google.com/books?id=Vj-NDQAAQBAJ&pg=PA346&dq=canary+intitle...

		jgalt212 on Jan 2, 2018 \| parent \| context \| favorite \| on: Zero-Width Characters: Invisibly fingerprinting te... It is. https://books.google.com/books?id=Vj-NDQAAQBAJ&pg=PA346&dq=c... Red Sparrow also has a canary trap, and they refer to it thusly. https://books.google.com/books?id=l-lnAwAAQBAJ&pg=PA428&dq=c...