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How does the ap determine that a bookplate has been affixed to the page and isn't just placed there to bypass the ap security? I can see taking one bookplate with no sticky on the back into a library or bookstore and simply shooting photos of it on the copyright page of any book one wants...
Tried a few out to see - it seems that the listings with magnet links are legit, but there are others that want you to download a *.exe file which is highly suspect.