[Spooky23]

That might work for a 2 party call. But I was on a call this afternoon with 70 participants — which of the 70 recordings do you want to keep?

It’s a hard problem, which gets much easier and delivers a better UX if you can trust the service provider. Also consider why you trust 70 meeting participants more than Zoom/Microsoft/Google/Verizon?

[superice]

It's not that hard. Instead of generating 70 end-to-end encrypted recordings of your meeting, you just generate 70 end-to-end encrypted packets with a shared symmetric key inside that allow you to decrypt the meeting encrypted with that shared key. You only need one version of the recording because there is only one symmetric key, but you transmit that to each client using their public/private keypair.

[scubbo]

> consider why you trust 70 meeting participants more than Zoom/Microsoft/Google/Verizon?

For the very simple reason that "the people that I choose to communicate with are people that I have chosen to communicate with", whereas the communication medium chosen is "the least-bad available". I am able to take whatever other measures I wish via other channels to verify and built-trust-in the participants, but I cannot do so with the communication medium owner.