Using a digital signature provides the best form of non-repudiation, as it uniquely ties the attendee to their digital identity ensuring that their attendance is authentically recorded. Traditional video recording can show who was present, but it does not provide a cryptographic guarantee of the attendee's identity. Biometrics and receipts can help support non-repudiation but are not directly applicable or as effective in the context of confirming attendance in a remote video conference.
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Why is a recording of a video conference less effective for non-repudiation?