Technicolor’s Security Newsletter Issue #20 has a superb article on watermarking stereoscopic 3D. It starts slow (first the dinosaurs died and they all turned into 3D pixels), but it ramps up fast and includes tiny Greek symbols for those who are inclined to such things.
But generally it fills in a lot of details that are not often discussed outside the hallowed halls:
Watermarking 3D Movies, Security Newsletter 20, Security Newsletters – Technicolor
It doesn’t mention it directly, but it is another wake-up call for getting a picture meta-data protocol and/or standard in the film-to-post realm.