i dont know about restricting user to save page from address bar.
your code works perfectly for webpage.
i have found little bug.
what if user right click on your page and click on save as..
for that use :-
<body oncontextmenu="return(false);">
as per my knowledge:-
you can't prevent your site from being downloaded, because that is what every user's browser is doing to display it.
The other option is to try and make it more difficult or annoying for them to download it, by using JavaScript to change the behavior of the mouse buttons.
in I.E. you can download your page using menu->file->save as..