Just wondering as the 'Chatham House Rules' is so often quoted, whether people realise that there is but one rule that people are referring to:
'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.'
Common usage incorrectly suggests that anything said has to stay within the original 'four walls'...which ain't a lot of use.
Then of course in our increasing interconnectedness, there is the risk of deanonymisation. At least one of those is a made up word!