There is a way, which doesn't involve decrypting. As long as you just use the book for your personal use... and don't put it out there... If you have a audio editor or any software that can record output, set it to record the output of say itunes, or your phone, press record, then press play. Granted this is a time-consuming process, and frankly not something I do myself; as I prefer having voiceover read the books; but that's a option. To be frank I really don't understand why the, drm with things like books / movies. I get it piracy; but at this point? Piracy is just used as a excuse for drm in lots of cases, this beeing one of those IMO.
15, I think I know what your talking about; but I'm pritty sure that doesn't work with drm protected content. Tried it back when I had apple music and no dice, if what your talking about is going into the convert to, menu.
sound designer for mental vision, and Eurofly3.
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My freesound pageWhere I post sounds I record. ps: if you use my sounds, remember to credit me smiley