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Old 06-07-2011, 03:28 PM   #2
KevinH
Wizard
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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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