Like others pointed out, the "natural state" is even further from ideal. I'm not an expert on cryptography at all, but I think signatures would help in certain

Like others pointed out, the "natural state" is even further from ideal. I'm not an expert on cryptography at all, but I think signatures would help in certain situations (and /u/jonahhorowitz brings this up above me). More advanced media - the next step beyond videos, maybe involving 3D or VR - would make fabrication harder. I'm sure there are solutions out there.