> “Each watermark carries a low-fidelity time-stamped version of the unmanipulated video under slightly different lighting. We call these code videos,”

If this is the only info that's encoded, then that might not be an entirely bad idea.

(Usually, the stego-ing of info can help identify, say, a dissident who made a video that was critical of a regime. There are already other ways, but defeating them is whack-a-mole, if universities are going to keep inventing more.)

> Each watermarked light source has a secret code that can be used to check for the corresponding watermark in the video and reveal any malicious editing.

If I have the dissident video, and a really big computer, can I identify the particular watermarked light sources that were present (and from there, know the location or owner)?