"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 3rd 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.
Child Finder Service: Thorn and Microsoft have been working together for several years now
to fight child exploitation and human trafficking. In addition to sharing PhotoDNA
technology with Thorn, Microsoft has provided technology and volunteers in support of a
project originally called ‘Child Finder Service’; this project emerged from hackathons initiated
in 2015 and 2016, and culminated in the donation of technology to Thorn for inclusion
within their Spotlight product. These innovations have since been evolved and augmented
by other technologies and organizations to help find missing children faster."