Our recommendation is for you to implement a technical solution on your server to prevent "hotlinking" of images. The most comprehensive solution is to use an htaccess file to prevent users from linking to your images without your permission. Instructions on how to set up an htaccess file are located at these sites:

Another comprehensive solution is this product:

Also, the vast majority of people who hotlink to items use an image search engine like Google Image Search. You can use a robot.txt file to prevent search engines like Google from adding your pictures to their image search index. Instructions on how to prevent being added to the Google index are here: