The first record in the Palm Database Format gives more information about the Mobipocket file. Also see EBook HTML for Mobi7 version of HTML. Mobipocket have some minimal file format info, mainly about the HTML encoding they use in the text of the book, at (replaced with archive copy). The files are identified as Creator ID of MOBI and a Type of BOOK. The header of that format includes the name of the database (usually the book title and sometimes a portion of the authors name) which is up to 31 bytes of data. Like PalmDOC, the Mobipocket file format is that of a standard Palm Database Format file. The format description below applies to both file types. Note that AZW for the Amazon Kindle is the same format as MOBI except that it uses a different DRM scheme. Currently the source files follow the guidelines in the Open eBook format. Huffcdic.py available as part of the Calibre project.įrom time to time features have been added to the format so new files may have problems if you try to read them with a down level reader. The higher compression mode is using a Huffman coding scheme that has been called the Huff/cdic algorithm. There are some third party programs that can read the eBooks in the original MOBI format but there are only a few third party programs that can read the eBooks in the new compressed form. However there is also a high compression version of this file format that compresses data to a larger degree in a proprietary manner. Many MOBI formatted documents still use this form. MOBI format was originally an extension of the PalmDOC format by adding certain HTML like tags to the data (See EBook HTML). Mobi source files are based on the OEB, Open eBook standard. Note that Mobipocket prohibits their DRM format to be used on dedicated eBook readers that support other DRM formats. prc extension is used because the PalmOS doesn't support any file extensions except. In either case it may be DRM protected or non-DRM. The extension can be changed by the user to either of the accepted forms. MOBI is the format used by the MobiPocket Reader and Amazon Kindle Readers.
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