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Old 06-07-2011, 04:23 AM   #1
RecQuery
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EXTH Header Question

I'm tried searching but with no luck and I was wondering if anyone knows what the EXTH - 3 - drm_ebookbase_book_id header is and what's it used for?

Obviously from the name it's something DRM related, but every book I have has a different number, is it kind of like a DRM ISBN or what?
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Old 06-07-2011, 03:28 PM   #2
KevinH
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Sorry but no one knows. There are actually 3 related extended header items (according to our own Wiki on the Mobi format)

1 drm_server_id
2 drm_commerce_id
3 drm_ebookbase_book_id

These are most probably involved in DRM generation and as you guessed possibly tracking. Once the DRM has been removed, you can typically change any of the metadata / exth header items including TTS, and the like.
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