The iPhone Dev Team has updated their redsn0w jailbreaking tool to version 0.9.10b5 to resolve a DRM issue that was being encountered in iBooks on jailbroken devices. iOS hacker Yiduo Wang (@planetbeing) worked on the patch, which removes the ability of iBooks to detect if your device has been jailbroken or not.
On jailbroken devices, some iBooks images have been not showing up or displaying incorrectly. Redsn0w 0.9.10b5 for Mac OS X and Windows allows for an untethered jailbreak on A4-powered devices such as the iPhone 4, original iPad, and latest iPod touch. Chronic Dev’s Corona package on Cydia is expected to receive the same fix soon.
From the iPhone Dev Team’s blog post:
Update #5: redsn0w version b5 incorporates yet another fix for iBooks, this time involving DRM. @planetbeing wrote a utility called “crazeles” that overcomes jailbreak detection by iBooks that would cause about 10% of images to show incorrectly. This fix is similar to the “hunnypot” fix that @comex wrote for the 4.x jailbreak. As usual, you can choose to install the fix either by re-running redsn0w over your existing jailbreak (de-select Cydia if you do that), or by installing the corona package from Cydia (it’s the same set of files no matter which way you choose).