Is there a way that a person could create a QR code made from one-way private key? The QR code would contain date and time and other Metadata that is decrypted with a public key that proved the QR code in the video was made by, for example, the person in the video? This would "prove" the video was real? I guess the speech would still be manipulated. So the whole transcript would have to be encrypted in this way...
I assume they are talking about signing/watermarking a video in a way that survives video encoding/lossy transmission. A QR code probably wouldn’t work for various reasons but is an easy mental analogy to think of.
