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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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