Presumably in a real application there would be a list of acceptable operations.
replyLike first you have to show you can do everything necessary in the system which is what this paper does. Step 2 is coming up with a policy of what restrictions to place on allowed transformations
Viewers could provide a way to see the original before transforms, and perhaps apply each one at a time to see how the end result is arrived at.
replyIf you're preserving the original, then you don't need the ZKP. Part of the appeal of this approach is that you could apply redactions or make the file smaller, without invalidating the signature.
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