I was looking for a simple mechanism to password protect article pages. After trying external php programs that were called with countless modules that wrapped php tags (some worked but were clunky), I found this.

The plug-in worked as soon as you enable it in the plug-in management area but you also have to make sure the Access Level in the Configuration Detail of the plug-in is set to "Registered" or the plug-in will only disable content and not allow the intended user(s) to see the content. This is undocumented but seems to work...

Again, great plug-in... Exactly what I was looking for...