This afternoon I have tried to figure out where recent versions of Kindle for Addroid stores annotations for .mobi got from somewhere else than Amazon.
From this forum I learned that the bookmarks/annotations used to be saved in .mbp files. However Amazon decided to encrypt the file so .mbp became .embp.
For my Kindle for Android app I cannot find neither .mbp nor .embp.
There is no file that seems to contains annotation neither in /sdcard/kindle nor /sdcard/Android/data/com.amazon.kindle/files.
However there is a file in protected folder:
/data/data/com.amazon.kindle/databases/annotations.db
(You must gain root to access the file.) The file is a plain SQLite database. Annotation table contains the following columns:
BOOKID - the part of the string is ASIN
TYPE - 0 stands for a bookmark, 2 is an annotation
START_POS, END_POS are integers that seems to define an annotation"position" range. The screenshot of SQLite viewer showing content of the file is attached.
I don't know how to relate the position to the contents of the .mobi file.
Possibly it is similar to .mbp format, which specification I cannot find. My Perl is too rusty to analyze sources of mbp reader script (
http://www.angelfire.com/ego2/idleloop/mbp_reader.html)... so I decided to ask for giving me a hand.
The aim of exercise is to retrieve annotations from ebooks called by Amazon "personal" - ones purchased in other bookstores or got from public domain cloud.
As we know there is no highlights from "personal" documents at
https://kindle.amazon.com/your_highlights. I think it is okay, as this is a convenience feature that Amazon is not obliged to support for books purchased from other vendors.
What I don't quite understand why Amazon decided to encrypt annotations for non-encrypted ebooks. Finally annotations storage completely disappeared from user accessible folders in case of Kindle for Android app, which includes Kindle Fire as far I know.