even if you scrap the website google cache the website and its available if is no longer coming from you. blocking view-source is not possible with html.
if you are using java applet or flash then it will not be visible there are some other applications. there are techniques to disable browser saving file locally but then you are suppose to program this for every single browser exists.
the source of website if written in server side will never be visible on the browser for instance if you used java servlet, php, .net or ruby nothing will ever be avilable publicy unless someone hacks into the webserver i am still confuse what are you trying to acheive
