The important change is that LCP DRM is no longer supported [0] (git history was rewritten):
> Support for LCP DRM removal was included in the past, but Readium (the company who developed that particular DRM) has decided to [open a DMCA takedown request](https://github.com/github/dmca/blob/master/2022/01/2022-01-0...) in January 2022. This means that for legal reasons, this GitHub repository no longer contains the code needed to remove DRM from LCP-encrypted books.
> Support for LCP DRM removal was included in the past, but Readium (the company who developed that particular DRM) has decided to [open a DMCA takedown request](https://github.com/github/dmca/blob/master/2022/01/2022-01-0...) in January 2022. This means that for legal reasons, this GitHub repository no longer contains the code needed to remove DRM from LCP-encrypted books.
(Quote from the FAQ)
[0]: https://github.com/noDRM/DeDRM_tools/blob/master/FAQs.md#why...
This is the file that was removed: https://cloudflare-ipfs.com/ipfs/QmVoHkQ7AYMprL9eMtDQUa7zgGz...