From The Digital Reader:
Reports are coming in today that the latest version of Requiem, an app that removes Fairplay DRM from music and videos sold via iTunes, will now also remove the DRM from iBooks ebooks. It may have taken a couple years, but Apple is now as safe to buy from as any other ebookstore. You don’t have to worry about losing future access to content that you buy there.
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I’ve always thought that DRM only remained unbroken so long as no hacker was interested in breaking it.
Link to the rest at The Digital Reader