PhotoDNA Lets Google, FB and Others Hunt Down Child Pornography Without Looking at Your Photos

Earlier this week it came out that Google turned over a man whose emails had contained an unstated amount of child pornography. And while the world as a

via PetaPixel: http://petapixel.com/2014/08/08/photodna-lets-google-facebook-others-hunt-down-child-pornography-without-looking-at-your-photos/

high profile sites use PhotoDNA to track down illicit photos. Using a database of known images, PhotoDNA runs only the metadata of images through for comparison, without ever actually touching someone’s inbox.