The main and (only) thing that you need to do is this deployer:
* http://anonsvn.jboss.org/repos/jbossas/projects/demos/microcontainer/trunk/classloader/src/main/java/org/jboss/demos/classloader/deployers/DecrypterClassLoaderPolicyModule.java
As you can see, we change the CL policy to CrypterClassLoaderPolicy.
Or the commented code, where we just add translator to policy.
This is a better / easier way, but I need to check if this is already available in AS5.1.
I also added a way to do this declarative, via xml, but I really doubt this one is in AS5.1,
meaning you're definitely have to do it via adding a custom deployer.