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Old 02-11-2013, 10:32 PM   #6
kovidgoyal
creator of calibre
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Posts: 25,769
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Join Date: Oct 2006
Location: Mumbai, India
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The hidden field used is the calibre book UUID, which is what gets used when you send the book using calibre. Unfortunately, with MOBI there's no easy way to directly add that to a MOBI file.
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