Chatham House
Chatham House is the origin of the non-attribution rule known as the Chatham House Rule, which provides that attendees of meetings may discuss the content of the meeting in the outside world, but may not discuss who attended or identify what a specific individual said. The Chatham House Rule evolved to facilitate frank and honest discussion on controversial or unpopular issues by speakers who may not have otherwise had the appropriate forum to speak freely. Despite this, most meetings at Chatham House are held on the record, and not under the Chatham House Rule.