There is photo theft via someone taking yours and using it as their own on a site. This is why you see many ladies putting 'watermarks' with their name on their pics.
Second, if you mean can you stop someone from keeping your photo for their own non-website use? No. All they do is a simple 'Print Screen' to get the image and then they can save it any number of ways.
Once a pic is out there, it is out there. It can also be 'out there' long after a person takes down their website, if a place like the Internet Wayback Machine found it at some point.
Even if right-click is disabled, there are ways. There are simpler and more efficient ways to get a pic than the print screen trick. Vista has a snipping tool which can cut anything out of the screen and make it a jpg. XP can have the same thing with the right software, and I am pretty sure every Mac comes with that utility. And if you know about view source, then you know where I am going with that.
I would go along with what everyone else has said. Use a watermark of some sort. If someone wants to steal that and use it then they have other issues.
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