[bloopernova]

My opinion on this is that we will "soon" have "trusted" webcams that create some sort of signature in each frame. In other words, a way to say "this is what the camera saw, guaranteed".

Probably something that would be built into phones and laptops first.

Of course, we know that messing with such a datastream would be easy for us, but for enterprise users (think liability) and news organizations it could be a real boon.

[BenjiWiebe]

That's when you point your camera at a screen.

[toni]

Will the "trusted" webcam manufacturers then attempt to detect any screen curvature?

[PeterisP]

Technically it would not be "this is what the camera saw, guaranteed" but "this is what the possessor of some signing key asserts they saw".

If a single shoddy manufacturer of cheap webcams somehow leaks a key that should have been on that webcam, then any software can easily encode a video stream with signatures asserting "this is what the camera saw, guaranteed".