The key difference is this: all participants should check that E2EE has been applied successfully by checking the Shield with the Padlock Icon (Non E2EE meetings simply have a shield) at the top left of the client, and hovering over, that the 20 Digit Safety Number is the same for all attendees who have joined the meeting.
Some people at this point would ask – what is a Safety number? The Safety number is generated for verification that the meeting is EE2E otherwise mismatches in the number could signal something like a MITM (Man in the Middle) attack
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