epub DRM Removal is a commercial tool that allows to remove DRM from ePub ebooks.
Haven't tried to use it, since freeware epub DRM removal plug-in for
Calibre works just fine. Besides Calibre can convert epub files to other ebooks formats, so you can read epub ebooks whether you use
Kindle,
Sony Reader,
Nook or some other reader.
Download Calibre DRM removal plug-ins:
ebook DRM removal tools archive