FPE (Flash Project Encrypter) is a utility for doing your flash projects, encluding encryption, obfuscation and so on. Here is the features:

FPE (Flash Project Encrypter) Features:
1.Analyse the whole project, do pick out the redundant classes.
2.Do encrypt to actionscript3 to all swf files.
3.Do obfucate and inject random insturctions to whole project.
4.Do encrypt to the "Main" swf file.

The license of this software is Free Trial Software, the price is $100, you can free download and get a free trial.