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MobiDeDRM 0.07
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@ -1,6 +1,16 @@
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#!/usr/bin/python
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#
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# This is a python script. You need a Python interpreter to run it.
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# For example, ActiveState Python, which exists for windows.
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#
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# It can run standalone to convert files, or it can be installed as a
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# plugin for Calibre (http://calibre-ebook.com/about) so that
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# importing files with DRM 'Just Works'.
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#
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# To create a Calibre plugin, rename this file so that the filename
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# ends in '_plugin.py', put it into a ZIP file and import that Calibre
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# using its plugin configuration GUI.
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#
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# Changelog
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# 0.01 - Initial version
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# 0.02 - Huffdic compressed books were not properly decrypted
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@ -8,6 +18,7 @@
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# 0.04 - Wasn't sanity checking size of data record
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# 0.05 - It seems that the extra data flags take two bytes not four
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# 0.06 - And that low bit does mean something after all :-)
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# 0.07 - The extra data flags aren't present in MOBI header < 0xE8
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import sys,struct,binascii
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@ -142,16 +153,22 @@ class DrmStripper:
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records, = struct.unpack('>H', sect[0x8:0x8+2])
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mobi_length, = struct.unpack('>L',sect[0x14:0x18])
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extra_data_flags = 0
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if mobi_length >= 0xE4:
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if mobi_length >= 0xE8:
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extra_data_flags, = struct.unpack('>H', sect[0xF2:0xF4])
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crypto_type, = struct.unpack('>H', sect[0xC:0xC+2])
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if crypto_type == 0:
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raise DrmException("it seems that this book isn't encrypted")
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if crypto_type == 1:
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raise DrmException("cannot decode Mobipocket encryption type 1")
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if crypto_type != 2:
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raise DrmException("invalid encryption type: %d" % crypto_type)
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raise DrmException("unknown encryption type: %d" % crypto_type)
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# calculate the keys
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drm_ptr, drm_count, drm_size, drm_flags = struct.unpack('>LLLL', sect[0xA8:0xA8+16])
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if drm_count == 0:
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raise DrmException("no PIDs found in this file")
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found_key = self.parseDRM(sect[drm_ptr:drm_ptr+drm_size], drm_count, pid)
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if not found_key:
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raise DrmException("no key found. maybe the PID is incorrect")
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@ -173,7 +190,41 @@ class DrmStripper:
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def getResult(self):
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return self.data_file
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print "MobiDeDrm v0.06. Copyright (c) 2008 The Dark Reverser"
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if not __name__ == "__main__":
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from calibre.customize import FileTypePlugin
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class MobiDeDRM(FileTypePlugin):
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name = 'MobiDeDRM' # Name of the plugin
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description = 'Removes DRM from secure Mobi files'
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supported_platforms = ['linux', 'osx', 'windows'] # Platforms this plugin will run on
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author = 'The Dark Reverser' # The author of this plugin
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version = (0, 0, 7) # The version number of this plugin
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file_types = set(['prc']) # The file types that this plugin will be applied to
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on_import = True # Run this plugin during the import
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def run(self, path_to_ebook):
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of = self.temporary_file('.mobi')
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PID = self.site_customization
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data_file = file(path_to_ebook, 'rb').read()
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try:
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file(of.name, 'wb').write(DrmStripper(data_file, PID).getResult())
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except Exception, e:
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# Hm, we should display an error dialog here.
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# Dunno how though.
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# Ignore the dirty hack behind the curtain.
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# strexcept = 'echo exception: %s > /dev/tty' % e
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# subprocess.call(strexcept,shell=True)
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raise e
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return of.name
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def customization_help(self, gui=False):
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return 'Enter PID'
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if __name__ == "__main__":
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print "MobiDeDrm v0.07. Copyright (c) 2008 The Dark Reverser"
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if len(sys.argv)<4:
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print "Removes protection from Mobipocket books"
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print "Usage:"
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