Chatham House
Chatham House is the origin of the anonymity rule known as the Chatham House Rule. Guests attending a seminar may discuss the results of the seminar in the outside world, but may not discuss who attended or what any person said. The Chatham House Rule helps frank and honest discussion on controversial or unpopular issues by speakers. Despite this, most meetings at Chatham House are actually held on the record, and not under the Chatham House Rule.