I imagine the only truly secure way to do it would be to transcribe the meeting (automatically or manually) and leak the transcription. The video/audio could be

I imagine the only truly secure way to do it would be to transcribe the meeting (automatically or manually) and leak the transcription. The video/audio could be shared with one or two trusted journalists to prove it's legitimate (barring sophisticated deepfakes), and the journalists could post the transcript. Maybe in theory even a transcription could be unsafe if the server actually manipulated the words in real-time in some way so that different listeners would hear different word synonyms at certain points, but that seems very convoluted and unlikely.