Decrypter for VitalSource's VBK Format
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StevesAMonkey c9f1350840
Updating readme to clarify we're not the creators of the code
2 years ago Updating readme to clarify we're not the creators of the code 2 years ago
vbk_decrypt.py3 Initial data 4 years ago

This repository is a mirror of an original Reddit Post

I did not create this code. I merely found it useful to make a mirror of it. It is currently not working with the latest version of the VitalSource books. Please feel free to make any PR's (many people will love you for it).

Original Post details:

The script is located here: Please read the whole post before replying with issues. I plan on doing a whole re-write of this script to use traditional methods instead of methods that "just work".

Screenshot of Successful Output

So in the past few months, I've had my eye on a book that I could only find (in digital format, at least) on VitalSource. After doing some research on the DRM, I noticed that there's not any tools to strip the books of their DRM directly -- rather just images and such. After doing a bit of research on their DRM with some free books, I was able to figure out their DRM and crack it almost completely. The script I wrote will decrypt MOST VBK books, but it does not support the oldest algorithm "aes" (yet).

Please note this only works on paid-for books! Prerequisites

This script is made for Python 3 and is not yet backwards-compatible with Python 2, so please make sure you're using the right Python version before posting any issues.

The libraries required are PyCryptodome. They can be had by running pip3 install pycryptodomex in an admin command prompt; please make sure you're using Python 3's pip.

The files required for decryption can be found in: %PUBLIC%\Documents\Shared Books\VitalSource Bookshelf\ and/or %USERPROFILE%\Documents\My Books\VitalSource Bookshelf\

Your license.vbk file (usually found in %USERPROFILE%\Documents\My Books\VitalSource Bookshelf\User Data\)
The book(s) you want to decrypt & extract.

Using the Script

To use the script, I'd recommend you create its own folder and inside that folder, create a folder named Books for your actual VBK books.

In the first folder you made, place the script and license.vbk file inside.

To run the script, open command prompt and jump to the created directory or, while in the directory in your file explorer, simply hold shift, right-click, and click on Open Powershell Here or Open Command Prompt Here.

Enter python (or py -3 if Python 3 is not your default Python).

After several seconds, it should be done extracting books to a folder called Output!

The way I name the output files is by their decryption key, so please make sure to title your books yourselves.

If your book is an ePub book, I recommend converting it to an ePub again using Calibre as to fix any mistakes that will likely occur.

If your book is a PDF book, all of the work is done for you!

If your book has an unknown format, the extracted files should be in the Output folder in its own folder -- let me know if you have an unknown format that you want supported by messaging me. Wanna Help Improve the Script?

The code is pretty bad as I'm somewhat new to Python -- if you feel there's something you want to add or improve, feel free to reply or message me. Change Log

EDIT0: Fixed an issue with key parsing in some cases.

EDIT1: Fixed an issue with copying extracted files from an unknown book format, added support for the "picturebook" format, and (attempted) to make paths compatible for most platforms.

EDIT2: Added support for older Windows licenses; still looking into other platforms!

EDIT3: Added support for Mac OS/X licenses.

EDIT4: Came up with a less "hacky" method of parsing the filemap. Removed support for "picturebooks" as the library I used is incompatible with some Mac OS/X installs. I also now parse "bookInfo" in the footer's "metadata" element, so output files and folders are named after their book titles.

EDIT5: Fixed an issue where the script would read the .DS_store file in the Books directory and assert an invalid header error. (Thanks, SPG!)

EDIT6: Added support for Android licenses.

EDIT7: Fixed an issue where "item" would show up as a result of decryption even if the key was invalid - allowing for an invalid key to be associated with a book.

EDIT8: Fixed an issue with the "win2" private key not importing correctly (due to being encoded incorrectly).