Introduction

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

Architecture

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

Main functions 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 by 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 want to remove DRM without adept_remove, you can export your private key and import it within Calibre an its DeDRM plugin.

Dependencies

For libgourou:

externals :

• libpugixml

internals:

• uPDFParser

For utils:

• libcurl
• openssl
• libzip
• libpugixml

External & utils dependencies has to be installed by your package manager (apt for example). Use -dev flavours to get needed headers. Internal libraries are automatically fetched and statically compiled during the first compilation. When you update libgourou's repository, don't forget to update internal libraries with:

make update_lib

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*)] [all*|clean|ultraclean|build_utils|install|uninstall]

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

other variables are DESTDIR and PREFIX to handle destination install directory

• Default value

Utils

First, add libgourou.so to your LD_LIBRARY_PATH

export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:$PWD

You can optionaly specify your .adept directory

export ADEPT_DIR=/home/XXX

Then, use utils as following:

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

./utils/adept_activate -u <AdobeID USERNAME>

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

To download an ePub/PDF:

./utils/acsmdownloader <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 <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

Binary packages

Compiled version (and AppImage) of libgourou and utils are available in Release page

Docker

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

Copyright

Grégory Soutadé

License

libgourou : LGPL v3 or later

utils : BSD

Special thanks

• Jens for all test samples and utils testing
• Milian for debug & code
• Berwyn H for all test samples, feedbacks, patches and kind donation

Donation

https://www.paypal.com/donate/?hosted_button_id=JD3U6XMZCPHKN

Donators

• Berwyn H
• bwitt
• Ismail
• Radon