One of the best things about the Chatham House rule is that unlike similar agreements such as "off the record" or "on background" it is clearly and unambiguously defined. There's literally a website for it https://www.chathamhouse.org/about-us/chatham-house-rule
Comments
Like that?
Reading it, though, it’s really clear what the intent is. Somewhat dispiriting that so many people seem to have trouble with it (going by the other replies here).