[juuular]

You might find this interesting:

Reverse engineering yet another ebook format (Nemanja Mijailovic) https://mijailovic.net/2022/12/25/hkpropel/

[cratermoon]

I did read that. The format he had wasn't really locked down, it was just a regular epub behind a crappy web-based viewer. The library epub downloads really do have DRM locks.

[mdaniel]

With discussion: https://news.ycombinator.com/item?id=34125958