Thorium Book Extractor

Thorium Book Extractor is a small utility that automates the process of extracting EPUB books exported from the Thorium Reader. It follows the manual process described in the referenced article and performs the required steps automatically.

The tool takes an EPUB file exported from Thorium Reader and generates a usable version of the book.

⚠️ Requirements

Before using this tool, make sure the following requirements are met:

• Thorium Reader version: 3.1.0
• The book must be exported from Thorium Reader first
• Thorium Reader must be closed before running the extractor

Download Thorium Reader 3.1.0 here:
https://github.com/edrlab/thorium-reader/releases/download/v3.1.0/Thorium.Setup.3.1.0.exe

Reference article explaining the manual process:
https://shkspr.mobi/blog/2025/03/towards-extracting-content-from-an-lcp-protected-epub/

How It Works

The extractor automates the manual extraction process described in the article. After exporting a book from Thorium Reader, the tool processes the file and generates a new EPUB file.

The output file will have the same name as the original file with _decrypted appended.

original_book.epub
↓
original_book_decrypted.epub

Step 1 – Export the Book from Thorium Reader

1. Open the .lcpl file in Thorium Reader.
2. Export the book as EPUB.
3. Close Thorium Reader completely.

⚠️ The extractor will not work correctly if Thorium Reader is running.

Step 2 – Run Thorium Book Extractor

Option 1: Process a Single Book

Run the tool from the terminal:

ThoriumBookExtractor.exe path_to_the_book.epub

Example:

ThoriumBookExtractor.exe my_book.epub

The tool will generate:

my_book_decrypted.epub

Option 2: Process Multiple Books

You can also extract multiple EPUB files automatically.

1. Place ThoriumBookExtractor.exe in the folder containing your EPUB files.
2. Double-click the executable.

The application will:

• Scan the folder for .epub files
• Process each file
• Generate a decrypted version for each one

Important Notes

• Always close Thorium Reader before running the extractor
• The tool is designed to work with Thorium Reader version 3.1.0
• Input files must be EPUB files exported from Thorium Reader

Disclaimer

This tool is intended for personal use to access books you legally own. Ensure that your usage complies with local copyright laws and the terms of service of the platform from which the book was obtained.