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libgourou is a free implementation of Adobe's ADEPT protocol used to add DRM on ePub/PDF files. It overcome the lacks of Adobe support for Linux platforms.


Like RMSDK, libgourou has a client/server scheme. All platform specific functions (crypto, network...) has to be implemented in a client class (that derives from DRMProcessorClient) while server implements ADEPT protocol. A reference implementation using Qt, OpenSSL and libzip is provided (in utils directory).

Main fucntions to use from gourou::DRMProcessor are :

  • Get an ePub from an ACSM file : fulfill() and download()
  • Create a new device : createDRMProcessor()
  • Register a new device : signIn() and activateDevice()
  • Remove DRM : removeDRM()
  • Return loaned book : returnLoan()

You can import configuration from (at least) :

  • Kobo device : .adept/device.xml, .adept/devicesalt and .adept/activation.xml
  • Bookeen device : .adobe-digital-editions/device.xml, root/devkey.bin and .adobe-digital-editions/activation.xml

Or create a new one. Be careful : there is a limited number of devices that can be created bye one account.

ePub are encrypted using a shared key : one account / multiple devices, so you can create and register a device into your computer and read downloaded (and encrypted) ePub file with your eReader configured using the same AdobeID account.

For those who wants to remove DRM without adept_remove, you can export your private key and import it within Calibre an its DeDRM plugin.


For libgourou :

externals :

  • None

internals :

  • PugiXML
  • uPDFParser

For utils :

  • libcurl
  • OpenSSL
  • libzip

Internal libraries are automatically fetched and statically compiled during the first run. When you update libgourou's repository, don't forget to update internal libraries with :

make update_lib


Use make command

make [CROSS=XXX] [DEBUG=(0*|1)] [STATIC_UTILS=(0*|1)] [BUILD_UTILS=(0|1*)] [BUILD_STATIC=(0*|1)] [BUILD_SHARED=(0|1*)] [all*|clean|ultraclean|build_utils]

CROSS can define a cross compiler prefix (ie arm-linux-gnueabihf-)

DEBUG can be set to compile in DEBUG mode

BUILD_UTILS to build utils or not

STATIC_UTILS to build utils with static library (libgourou.a) instead of default dynamic one (libgourou.so)

BUILD_STATIC build libgourou.a if 1, nothing if 0, can be combined with BUILD_SHARED

BUILD_SHARED build libgourou.so if 1, nothing if 0, can be combined with BUILD_STATIC

  • Default value


You can import configuration from your eReader or create a new one with utils/adept_activate :

./utils/adept_activate -u <AdobeID USERNAME>

Then a ./.adept directory is created with all configuration file

To download an ePub/PDF :

./utils/acsmdownloader -f <ACSM_FILE>

To export your private key (for DeDRM software) :

./utils/acsmdownloader --export-private-key [-o adobekey_1.der]

To remove ADEPT DRM :

./utils/adept_remove -f <encryptedFile>

To list loaned books :

./utils/adept_loan_mgt [-l]

To return a loaned book :

./utils/adept_loan_mgt -r <id>

You can get utils full options description with -h or --help switch


A docker image (by bcliang) is available at https://github.com/bcliang/docker-libgourou/

Grégory Soutadé


libgourou : LGPL v3 or later

utils : BSD

Special thanks

  • Jens for all test samples and utils testing
  • Milian for debug & code