How to protect source codes

Is there a javascript code that prevents viewers from saving web files via the website?

e.g. If i have a webpage online which includes images, text, swf etc, i want to make it safe so that no one can simply do a:
“File | Save As | Webpage complete”

and use the files to their advantage.

I simply want the saved html to be a blank html page, and the images not to be included in the save.

Thanks :slight_smile: