Apple, it seems, may be trying out some anti-jailbreak code in its iBooks e-book reader app. The app intentionally tries to run an some unsigned executable code every time you try to open a book -- and if it runs, iBooks knows the device is jailbroken and refuses to open your e-books.
Fortunately (or unfortunately for Apple), the iPhone Dev-Team has released a new version of the PwnageTool jailbreak that incorporates the Chronic Dev Team's 'feedface' iOS 4.2.1 untether and circumvents Apple's crippling code.
Apple's intentional hijacking of iBooks is an interesting move, but given its less-than-amiable stance on jailbreaking it's surprising that it's taken this long to actually implement anti-jailbreak mechanisms -- especially after removing the infamous jailbreak API back in December. It now becomes a question of when Apple will insert similar measures into other iOS apps -- and whether they will be a whole lot more destructive than merely blocking e-books. The Age of Bricking may be upon us!