I think it's a complete mockery to leave Linux users to fend for themselves, without the ability to open acsm files. Today we bought a book on Google Books, downloaded it to ACSM and still can't open it. If you import it into Windows, you get a Google Limit Reached Device error. This is a complete blasphemy and mockery. Can't you at least give us the option to export to EPUB? And now we're trying to open ACSM in Linux, but so far to no avail. Calibre + deDRM + deACSM did not work.