A survey of 10 data brokers in a report for Duke University’s Sanford School of Public Policy’s Cyber Policy Program found they advertise sensitive data on U.S. individuals, including military personnel, author Justin Sherman writes in a blog for Lawfare. The data included demographic information, political preferences and beliefs, and real-time GPS locations. Sherman discussed concerns the data could be used to undermine national security and said data brokerage should be “a central part of robust federal privacy legislation.”