Steganographic systems used for tracking screeners would have no problem identifying the two different sources you've used. They are robust against all sorts of

Steganographic systems used for tracking screeners would have no problem identifying the two different sources you've used. They are robust against all sorts of attacks, timing changes and edits. Removing frames doesn't really affect this, since it's not doing dumb frame-by-frame matching. You'd have to degrade your audio and video to the point where they become unwatchable in order to remove the watermark. Disclaimer: I used to work for one of the companies providing these systems.