Originally Posted by Elfwreck
I think the only DRM on the market right now that hasn't been cracked is Apple's iBooks--and that's because iThings are a closed platform; you can't manipulate code and data on them. (And maybe I heard those had been cracked. I don't remember.)
With the appropriate tool and the right version of iTunes, the iBooks DRM can be removed. But for details, of course, you'll need to look elsewhere.