It would be interesting to know if you could write software to take a video with these flashes in it, post-process them out, morph the video to be taken from another angle, add in a different signature. Then claim the first video is fake and that the 2nd video is the true unedited version.

Total Relighting SIGGRAPH Talk: https://www.youtube.com/watch?v=qHUi_q0wkq4

Physically Controllable Relighting of Photographs: https://www.youtube.com/watch?v=XFJCT3D8t0M

Changing the view point post process: https://www.youtube.com/watch?v=7WrG5-xH1_k