Introduction

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.

Architecture

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()

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.

Dependencies

For libgourou :

• None

For utils :

• QT5Core
• QT5Network
• OpenSSL
• libzip

Compilation

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*)]

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

Utils

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

export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:$PWD
./utils/activate -u <AdobeID USERNAME>

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

To download an ePub/PDF :

export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:$PWD
./utils/acsmdownloader -f <ACSM_FILE>

To export your private key :

export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:$PWD
./utils/acsmdownloader --export-private-key [-o adobekey_1.der]

To remove ADEPT DRM :

export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:$PWD
./utils/adept_remove -f <encryptedFile>

Copyright

Grégory Soutadé

License

libgourou : LGPL v3 or later

utils : BSD

Special thanks

• Jens for all test samples and utils testing