一片全面介绍Script Encoding加密的文章，很全面可惜是E文的，不过也不难

Script Encoding with the Microsoft Script Engine Version 5.0
Andrew Clinick
Tired of exposing your Web scripting code to prying eyes? With version 5.0 of the Microsoft Script Engine and Internet Explorer 5.0, you can now encode your VBScript and JScript work so curious users can't grab it. Scripting has become a very popular component for people developing for the Internet or intranet. This popularity has been accelerated not only by its dynamic development environment and the ubiquity of script support in browsers and servers, but also the ability to see what programming tricks others have employed simply by loading a page into Notepad. While this is a great asset for the beginning script programmer, people who are developing increasingly complex, script-based applications want to be able to protect their hard work. Version 5.0 of the Microsoft® Windows Script engines introduces a new feature, Script Encoding, that takes the first step toward protecting script from prying eyes.
    The goal of Script Encoding is four-pronged: to provide an encoding mechanism that can be implemented without significantly affecting performance, exported without regulatory headaches, embedded within HTML and any application that uses scripting, and implemented cross-platform.
    Now let's see how these requirements affected the design of the Microsoft script engines. The first and perhaps most important consideration is that the script is encoded, not encrypted. Encoding means that the script is passed through a text-encoding cipher, which replaces the original text. Therefore, the encoded script could be decoded by any program that can decipher the text cipher, without the need for an encryption key. Encoding was introduced not to provide a watertight protection mechanism for scripts (Microsoft is working on that for the future), but to provide a format that would require a prospective pirate to go through a specific decoding process to get your script code. If you have a copyright statement in your code (more on that later), it'll be far easier to show that your work was illegally copied.