dtbprotect: implementation details

• Written in Objective Caml, a functional programming language
• Runs on several platforms, including MS Windows, GNU/Linux, Mac OS
• Uses xmlsec, a free and open-source library implementing XML encryption and XML signature
• For security, does not store generated encryption keys on disk

Example of use:

dtbprotect --input /tmp/book.opf --key /tmp/key.asc --output /tmp/output/