Is anyone familiar with "Secure HTML?"

http://www.buildwebsite4u.com/tools/secure-html.shtml

It takes any HTML file and creates new "secure" HTML file that is encrypted and asks for a password when you try to open it. If you enter the correct password, you'll see the original document, otherwise you'll see the blank window or a few meaningless characters.

The browser caches the encrypted version of the file, the original version exists only on your screen. Therefore, this method of creating password protected web pages is safer than many others.

And wondering what, exactly, they mean by:

The main purpose is creating password protected Web pages for your home or office computer. However, you can place them on any Web server to make them available to somebody else. Just keep in mind that encryption algorithm is simple and ensures only "home" security.