Introducing the program

A slide briefing analysts at the National Security Agency about the program touts its effectiveness and features the logos of the companies involved.

The program is called PRISM, after the prisms used to split light, which is used to carry information on fiber-optic cables.

This note indicates that the program is the number one source of raw intelligence used for NSA analytic reports.

The seal of
Special Source Operations, the NSA term for alliances with trusted U.S. companies.

Monitoring a target’s communication

This diagram shows how the bulk of the world’s electronic communications move through companies based in the United States.

Providers and data

The PRISM program collects a wide range of data from the nine companies, although the details vary by provider.

Participating providers

This slide shows when each company joined the program, with Microsoft being the first, on Sept. 11, 2007, and Apple the most recent, in October 2012.