Denunciations of the Chatham House Rule seem underdeveloped. According to the history on Wikipedia, it was invented to let members of post-WW1 English civic society discuss and debate potential reforms, and then get as much of that discussion into the public record as desired without having individual members pilloried for things they said during the discussion, even if the rest of the group disagreed with them. This…
The easy solution to this in my state is to just wear a recording device. I live in a one party consent state for the recording of conversations [1,2], whether on the phone or in person. I don't know how y'all get away without it in California. It pairs really well with free speech, and it feels wrong to not have this legal feature available. [1] https://www.justia.com/50-state-surveys/recording-phone-call... [2] htt…
And since you agreed to the chatham rules not to (i.e. you entered into a contract) you can still be liable for breach of contract in a civil court, with potential penalties and damages if those were part of the contract.
Of course anything you record can still be used in criminal or civil proceedings (e.g. if your interlocutor admits to a crime or utters illegal or tortuous speech, such as fraud, harassment, or verbal abuse).