Earlier quoted context omitted.
That will just move the hack one level further down and will create even more confusion because then you'll have a 'properly signed video stream' as a kind of certificate that the video wasn't manipulated. But you don't really know that, because the sensor input itself could be computer generated and I can think off the bat of at least two ways in which I could do just that.
"That will just make it more difficult to make fakes." Yes that's kind of the point. Plus I'm sure they could put the whole camera in a tamper resistant case. They could make it very difficult to access the sensor. Including focus data should make "record a screen" a bit harder too. I guess recording a projection would be pretty hard to detect, but how likely is it that people would go to those lengths, vs using a si…
Please don't use quotes when you are not quoting.