[traspler]

So from what I understood, the clients had no way of accessing an encoded WebRTC video frame before it was sent over the network. Only with the new Insertable Streams is this possible. So they kind of plan to do what you say, encrypt it "manually" on client and let the router mirror it. Sharing the key as you proposed still dictates that you can p2p connect to all participants. Sadly that's not possible in all NAT situations and you would still need a TURN server for the clients to meet, having a again a central point.