FBReader 2.1 has been released with support of DRM-protected ebooks. Other new features include secure network password storage, optional usage statistics, editable bookmarks, Slovenian localization, and minor improvements and bug fixes.
https://alternativeto.net/news/2024/7/popular-ebook-reader-fbreader-now-supports-drm-protected-ebooks-in-its-2-1-version/