Chatham House Rule

When a meeting, or part thereof, is held under the Chatham House Rule, participants are free to use the information received, but neither the identity nor the affiliation of the speaker(s), nor that of any other participant, may be revealed. From Chatham House, the name of the building in London that houses the Royal Institute of International Affairs, by which the rule was devised in 1927 and refined in 1992 and 2002.