This is the second release of Redsn0w in past two weeks. After the release of Untethered Jailbreak for iPhone 4S and iPad 2, the Dev-team Released an update to their tool called Redsn0w to 0.9.10b4 to fix some issues with iBooks to work on iOS 5.0.1. That release mainly fixed the issue with Sandbox thing on iOS 5.0.1 with iBooks.
After the release of Redsn0w update, Apple released a new update to their iBooks to the new version called iBooks 2. iBooks 2 came with many new features and compatibility with MAC OS X also. With the release of iBooks 2, Apple might have fixed the issues with Sanbox which were caused after Jailbreaking your iOS Devices.
So today, The Dev-Team released a new update to their tool Redsn0w to 0.9.10b5 which fixes the issues with DRM.
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).
The issue with the new iBooks was that it used to show 10% of the total images improperly due to the jailbreak detection feature present in it. To apply this fix, you can simply re run the latest Redsn0w over the current jailbreak by unchecking Cydia or by installing the Corona files from Cydia.
You can download Redsn0w 0.9.10b5 from here.