adobe's adept drm for epub files has been broken. i have ~30 books that i bought from sony's connect ebook store. i now read those on my kindle thanks to kindlegen.
oh, once you have recovered your adept encryption key, stripping off the drm is as easy as using kindlegen. just drag the script, epub file, and the adept key file into the terminal.app window and away it goes! you can even pipe unix commands to do the drm stripping and epub->mobi conversion in one step.
i have just one bit of advice for anyone removing drm: please don't steal. i got involved in this because i wanted to archive my legitimate purchases in a vendor-neutral and unencumbered format.
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