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Originally Posted by jhowell
No. That post has a partial description of the watermark format.
The watermark is encrypted but it is possible to infer what sort of things it encodes. By comparing many watermarks it is possible to find correlations showing that one part is associated with the customer's account and another part with the particular book.
The DRM voucher is binary data that holds the key needed to decrypt contents of the book which is itself encrypted. It is stored in a separate part of the first record of the MOBI file as binary data.
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Thank you for your solution.
Then the voucher is removed by DeDRM, and only when the voucher is present, the watermark in the EXTH header is also removed.
I understood most of what you said.
And as to the thread title.
I see the watermark is just the .opf tag and the EXTH header.
So the kindle watermark is simpler than I thought.