what's the recommended method to encrypt flash files ?

i'd like to make some flash programs 开发者_StackOverflowthat are commericals, how can i made sure that they won't get decrypted or to make sure that i used to strongest file encryption possible.

Your best bet would be to deliver the content using Flash Media Server. Using either TMPe, RTMPte or RTMPs protocols automatically encrypts delivered content.

http://blogs.adobe.com/ktowes/2008/09/encryption_and_streaming_media.html for more info.

What you're looking for is a code obfuscator, a nifty tool that makes your swf difficult to reverse engineer. When someone tries to decompile your swf, the source code will look like gibberish.

Wikipedia Definition

Obfuscated code is source or machine code that has been made difficult to understand. Programmers may deliberately obfuscate code to conceal its purpose (a form of security through obscurity), to deter reverse engineering, or as a puzzle or recreational challenge for readers. Programs known as obfuscators transform human-readable code into obfuscated code using various techniques.

http://en.wikipedia.org/wiki/Obfuscated_code

Obfuscator Tools

secureSWF
well known, but it isn't free http://www.kindisoft.com

"Free SWF Obfuscator" Question on SA
Great answers here... Free SWF Obfuscator