pillabachapk Posted February 16, 2011 Report Posted February 16, 2011 [center][img]http://fastcache.gawkerassets.com/assets/images/4/2011/02/img_0350-200x300.png[/img][/center]Over at Social Apples, a recent 4.2.1 jailbreaker noticed something disconcerting after firing up iBooks on his newly-liberated device. Many of his ebooks didn't work.Since using the greenpois0n jailbreak, I have been unable to open some of my iBooks that I rightfully purchased from the iBook Store. I thought it was a problem with the downloaded books, so I re-downloaded them. That didn't work so I removed the iBooks from my iPhone and re-sync'd them from my computer… still no luck. Then I stumbled on a tweet from @comex tonight that really blew my mind."It seems that before opening a DRMed book, iBooks drops an improperly signed binary, tries to execute it, and if it works concludes that the device is jailbroken and refuses to open the book."
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