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Re:Google’s Role In Woodland Child Pornography Arrest Raises... by duskwuff on Sunday November 24, 2013 @03:05PM (#6790880)
See: http://www.missingkids.com/Exploitation/Industry

There is apparently both a database of MD5 hashes of "known bad" image files, as well as a "PhotoDNA" system for fuzzy image matching.

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