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Trivially detectable. Find two screeners. Search for different frames. Oh look, the credits are different! Let's delete the credits to be safe!

You want to make it so that the entire binary content of the film looks different for each person, so there can be no point of reference apart from what it looks like (which is the same).

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Oh of course. I don't doubt something more sophisticated would be used in practice.

Someone already brought this up, but the chance of a leaker getting hold of two screeners would be very low.

But yes, once it was discovered that information was being embedded in the credits, those would be cut.

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