From EXEdra PC Studio Bt:
With QuickWebLock, all you need to do is to choose a Web document (HTML, HTM, PHP) and specify a password, and at the click of a button, it generates a protected page that you can upload and link the same way as you would the source file. The only requirement is to have PHP installed on your server (ask your service provider, most of them have this service). That is because the password is not checked on the viewer's PC, but on the server (in contrast to most HTML protection solutions), which makes QuickWebLock extremely safe. It generates a sample protected Web page.