Rasticrac can also automate the decryption (FairPlay DRM) of the iOS binary and is very easy to use!
Rasticrac
Rapid Advanced Secure Thorough Intelligent Gaulish Nuclear Acclaimed Cracker
Rasticrac is a very powerful tool to decrypt the iOS app binaries. You can install Rasticrac with Cydia by adding the following Repo source in Cydia: http://cydia.iphonecake.com
