[sailormoon]

I thought the exact same thing! Can't remember if it's James Bond or what not, actually I think it was Ghost in the Shell, but it involved a heist whose detection was prevented by faking a video stream.

My first thought is why isn't there end-to-end digital signing from the camera to the monitor. Sure, you could probably still fake it out by getting into the camera and reading the key from ROM or whatever, but that's a hell of a lot harder than just tapping a cable.