NAME

     mobidrm — Utility for decryption and encryption of MOBI format ebook files.

SYNOPSIS

     mobidrm -d [-o dir] [-p pid] [-s serial] file
     mobidrm -e [-o dir] [-s serial] [-f date] [-t date] file
     mobidrm [-hv]

DESCRIPTION

     The program encrypts or decrypts MOBI files with DRM schemes used on eInk devices. It is
     powered by libmobi library.

     It may encrypt documents targeting particular device by using its serial number or applying
     generic DRM scheme targeting all supported readers.

     Optionally encryption may be valid only during chosen period. Kindles require both start and
     end date to be set.  This tool allows to specify only one date (start or end).  In such case
     the other date will be automatically set to respectively lowest (1970-01-01) or largest
     (10136-02-16) valid value.

     In case of hybrid files mobidrm separately encrypts both enclosed parts and produces two
     files: mobi for legacy format and azw3 for KF8 format.

     The program also decrypts documents. One must supply device serial number or document PID if
     DRM was applied for specific device.

     Invoked without arguments prints usage summary and exits.

     A list of flags and their descriptions.

     Decryption flags:

     -d       Decrypt. This flag must be set in order to decrypt document.

     -p pid   Set optional decryption pid (may be specified multiple times).

     -s serial
              Set optional device serial number (may be specified multiple times).

     Encryption flags:

     -e       Encrypt. This flag must be set in order to encrypt document.

     -f date  Set optional validity period from date formatted as yyyy-mm-dd. Document will not
              be valid before this date.

     -s serial
              Set optional device serial number. If not set document will be encrypted with
              generic reader key. This flag may be specified multiple times to target multiple
              devices.

     -t date  Set optional validity period to date formatted as yyyy-mm-dd. Document will expire
              after this date.

     Common flags:

     -o dir   Save output to dir folder.

     -h       Show usage summary and exit.

     -v       Show version and exit.

EXAMPLES

     The following command decrypts document using given serial number. Decrypted output will be
     saved to /tmp folder.

           % mobidrm -d -s B001XXXXXXXXXXXX -o /tmp example.mobi

     The following command decrypts document trying multiple PIDs.

           % mobidrm -d -p XXXXXXXXX1 -p XXXXXXXXX2 example.mobi

     The following command encrypts document targeting two devices using their serial numbers.
     Document will be readable only on those devices.

           % mobidrm -e -s B001XXXXXXXXXX01 -s B001XXXXXXXXXX02 example.mobi

     The following command encrypts document for device wth given serial number. Document will
     only be valid within given period (inclusive).

           % mobidrm -e -s B001XXXXXXXXXX01 -f 2021-01-01 -t 2021-01-31 example.mobi

RETURN VALUES

     The mobidrm utility returns 0 on success, 1 on error.

COPYRIGHT

     Copyright (C) 2021-2022 Bartek Fabiszewski.

     Released under LGPL version 3 or any later (same as libmobi).

WEB SITE

     Visit http://www.fabiszewski.net for details.

DIAGNOSTICS

     For diagnostics libmobi must be configured with --enable-debug option.

SEE ALSO

     mobimeta(1) mobitool(1)