Yes, it is possible without windows. All you need is a special ( old ) version of Adobe Digital Editions ( ADE ), it can be downloaded from the University of Chicago Press.
First setup Calibre as posted in the next articles :
Import your ebooks in ADE. If you can read them it’s time to start Calibre. Now import your books from the ” My Digital Editions ” folder in wine ( in my case : ~/.wine/drive_c/users/arie/My Documents/My Digital Editions ) in Calibre.
That’s it, your ebooks are now DRM free.
For personal use only