[ewidar]

While it does not seem enough to guarantee authenticity, this scheme does seem like it would prevent creating a video from scratch pretending to be taken at a protected location without having express knowledge of the key or the flickering at that moment in time.

Definitely interesting for critical event and locations, but quite niche.

[SoftTalker]

My question would be, who does have "express knowledge of the key or the flickering at that moment in time" and are they trustworthy?

[ewidar]

That would be whoever owns the private key, no?

It's similar to any other private/public key scheme: it just serves to prove the signature was generated by the owner (here whoever owns the location at which the video is taken).

But I guess you could imagine multiple flickering patterns per location, with each pattern being owned by a different entity (an NGO + a governement + a private company for example), in essence doing a multi-sig of the video.