The Adobe DRM has not been cracked, and you have already tried the only ways I am aware of for extracting the contents (printing, if allowed, and screenshots automated via copistar).
The DRM of three popular formats (MOBI, LIT, eReader) has been cracked, and Calibre will format shift DRM-free ebooks in any of these formats to ePub (or LRF). Of these, LIT is the closest to ePub and is what I would recommend if you have a Windows PC (MS Reader and Internet Explorer are required to buy LIT ebooks).
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