Get two leaked copies, and mix them up. Use the credits from copy A, or hell, even chop off 11 milliseconds from them. Then mix and match scenes... even chop off a few ms from some randomly selected scenes.
I bet you wouldn't even need the two copies.
Disclaimer: I used to work for one of the companies providing these systems.
Maybe something like Cinavia[1] could be used instead? It's an analog watermarking system for detecting pirated copies and refusing to play them if player detects such copy is played on something else than bluray disc. Apparently this survives transcoding, and was/is major pain for people ripping their discs for various reasons and trying to play the files on certified players.
Step 2: Run the whole thing through an optimizer seeking to minimize error while not being detected.
Step 3: Wait a few hours.
Obviously I can come up with anything and you would be able to present a strategy how to beat it. But that's not the point.
If this kind of various copyright protections become norm, people might actually be afraid to leak stuff, because you will never know how safe it is and what kind of protection you might run into. Even after analyzing spectrogram and generally watching the media multiple times, trying to find anything weird.
Well, obviously when you grab infinite number of watermarked copies, you might be able see where the irregularities are. But that's not how leaks happen.
They could change the opening credits by 2ms. Or a specific scene.
They could even add a single extra sword 'clang' noise in part of the audio track on one single scene.
There are so many options.
this should be the biggest obstacle.