I’m not no web master, but I would do these 2 things to stop that kind of stuff..
Here are a few ideas:
Disable right click so they couldnt save the image.
Although, I bet some could get around this possibly.
So,
Put a big copy right txt onto the preview picture. Once the picture is bought, whatever email was jotted down for the purchase.. email them the good copy of the photo.
hope this helped,
Dominick
Maybe blank out some parts but more than can be painted in
very easy yet will still have attraction to sell.
photoshop? put a big watermark over the photo, so even if it is copied it doesn’t look good.
If you don’t do this, there’s always going to be a way to copy them, whether it’s as simple as right-click and save them, or hit printscreen and paste into an image editor.
there might even be programs that prevent that, but you can always just go to your cache file and open it from there, etc. etc.
If you have a lot of photos, you might want to look for an online photo store that does this for you.
Outside of that you could keep the size of the photo online really small and send the original once it’s paid for.
I don’t know about any programs thatll do that for you, but as a seasoned picture stealer (haha) I know that
1. If you are going to put a watermark on a picture, make the watermark take up the entire picture. That might discourage any potential picture stealers from stealing it, because any small watermark can easily be photoshopped out, and a giant watermark can be a real pain to get rid of. So, your preview picture can have the watermark, and the picture the buyer downloads can be nice and pretty and watermark free.
2. Disabling the right click won’t do anything. Theres a nifty little button on the keyboard that takes screen shots of everything showing on the screen. Capture it, go into a paint program, click paste, crop everything but the picture and BAM. All done 
Again, the watermark will solve this.
Or what I’m about to tell you might too.
3. Make the preview picture small. Not thumbnail sized, but just a nice smaller version of the original sized picture. This way it might be too small for the would-be stealer to use, and even a good photoshop program cant enlarge it to a nice pretty replica, itll just enlarge it to a still unusable blurred and stretched no-so-pretty-anymore replica.
So if you cant find any programs, just use these tips.
Though two programs I will mention are Photoshop and the MUCH cheaper Paint Shop Pro, which you can use to add watermarks and resize pictures and stuff.
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krvmrhd on November 23rd, 2009
You can copyright watermark them visibly or invisibly. You can also disable the users ability to copy, right click..etc in HTML or whatever your using. Just be aware for everything you do there are ways around it….you can’t make dishonest people honest.