Chatham House Rule

== English == === Alternative forms === Chatham House rule === Etymology === Named after the headquarters of the UK Royal Institute of International Affairs, based in Chatham House, London, where the rule originated in June 1927. === Proper noun === the Chatham House Rule A rule, applied to some controversial debates and discussion panels, stating that anybody who attends is free to use information from the discussion, but cannot reveal who made any comment.