PhotoDNA: Developed in 2009 with Dartmouth College to help the National Center

of Missing and Exploited Children (NCMEC), Microsoft PhotoDNA is a free service

which helps to identify and remove online child abuse material. Hundreds of

organizations and technology companies around the world are using PhotoDNA

either directly through our cloud service, or indirectly through integrations with the

3

rd party tools they use to perform their jobs” to reduce child exploitation by

detecting illegal images by identifying the unique “hash” values of images and

matching that value with a database of known illegal content.19