Protect AS 2 source code

What is the best way to protect the source code in a .as file? Right now if you access the .as in a web browser the source code is displayed. The problem is that when the .swf file is loaded on the client’s machine, so is the .as file. I’m sure there are third party applications that could help do this. I’m open to any suggestions. Thanks for your time. I appreciate your help!