FPE(Flash Project Encryptor) is a small, easy to use application that can be used to encrypt and obfuscate Flash projects.
Not the same as other flash encryption tools, FPE can encrypt and obfuscate multiple swf files at one time. And the method calls between swf and swf will still right.
FPE(Flash Project Encryptor) is written using Adobe AIR and can be run on Mac OS X, Windows and Linux.