The Chatham House Rule helps create a trusted environment to understand and resolve complex problems. Its guiding spirit is: share the information you receive, but do not reveal the identity of who said it.
The Rule reads as follows:
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.
The list of participants should not be circulated beyond those participating in the meeting.
Source: Chatham House Rule | Chatham House – International Affairs Think Tank