Quote:
Originally Posted by JSWolf
If you are scrambling the ISBN number, also scramble the ID as the ISBN is sometimes used there. But you will have to use the same scrambled ID in the OPF in the NCX if the ID in the NCX matches that in the OPF. If they do not match than scramble the ID in the NCX.
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Yes I'm aware there are rules about certain ids in OPF/NCX needing to match. But as these would be throwaway books there's no need to make the values anything meaningful. I may add an explicit calibre run_check to flag if the scrambled book acquires new errors in the process.