gunar (1) [Avatar] Offline

I am developing some application and I use iText to generate some pdf files. To protect my code, I want to obfuscate it. For this, I use ant and proguard. The obfuscation fails as the obuscator cannot find reference to org.bouncycastle.*. After I have added this jar (I don't remember how I got that reference jar) there are other references classes missing.

So, my question: did any of you managed to obfuscate the iText code? Would there be other way to protect the code?