With the spread of advanced spying technology, such as social media monitoring and cell-phone tracking, it’s easy to forget about the most ubiquitous form of surveillance—regular old security cameras. But the San Francisco County District Attorney’s Office sure hasn’t forgotten. Prosecutors maintain a map and dataset of thousands of privately and publicly owned security cameras. When law enforcement is investigating a crime, officers can refer to this information to identify which cameras may have caught relevant footage. And through a public records request under the San Francisco Sunshine Ordinance, EFF recently obtained most of this data—the locations of 2,753 cameras—and we are now making it available to the public.