From EPIC.org:
The Department of Homeland Security (DHS) Privacy Office has released an unclassified version of the Privacy Impact Assessment (PIA) for the Initiative Three Exercise, a pilot exercise for the classified cybersecurity tool known as “EINSTEIN 3.” EINSTEIN 3 is the next generation of the U.S. Computer Emergency Readiness Team’s intrusion detection and prevention system for the federal government, which will involve active monitoring of all network traffic to and from federal agencies. DHS has not released the full, classified PIA for the tool in either complete or redacted form, but instead drafted a different version for release to the public.