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I had this happen to a client and even though they had both the web and print licenses they were hit with a 50k suite because the font file was malformed somehow. I'm not sure how it shook out but I hope they didn't pay a god damn cent.

How robust is that identification? Does it just look for file hashes or identical character shapes? I imagine it is trivial to repackage a font file to break the hash fingerprint.

Got a link to such a service?

https://www.fontradar.com is one. They also claim to analyze apps somehow.