Mind you, no method is totally effective, but Flickr doesn't offer the right click "protection" as is being discussed here. What they do offer is the ability to change who can download your photos. It's in your account settings under Privacy (Who can download my photos). You can set it to a several different things depending how you want it. But what this does is remove the "All Sizes" button and puts a spaceball.gif image over your photo so that right clicking will bring cause that to be saved instead of the photo. Again, this may discourage people, but like everything else, it's not a 100% safeguard.
