LCP DRM - Extracting Files

I think I've discovered a way to extract files from an ePub or PDF which has LCP Profile 2.0.

This research is a proof-of-concept. It requires Linux and is not automated. This doesn't reverse engineer the encryption or reveal the cryptographic keys.

While this works on my machine, I don't know how generally useful it is.

My blog post is at https://shkspr.mobi/blog/2025/03/tow...rotected-epub/