Create a camera that signs (not encrypts) images and video it records with a cryptographic key baked into the camera. A picture can therefore be authenticated as taken by the camera, and not edited with Photoshop.
It must not be possible to extract the private key from the camera, or else fake images could also be created and signed with the camera's key. It must not be possible replace the camera's key with another key. This might be a good use for DRM, though they could also be accomplished by a physical tamper-evident seal protecting the hardware.
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