Protect LOGO from "save as picture"

I'd like to know if there is a way to protect my logo from being "saved as picture" by a visitant.

May be a line in layout.css could protect this image.

Could I protect other images used in some articles as well?

NO! you can distract less professorial abusers by restricting left click , or trick like that, but content can not be protected once it reaches client browser using.