Transparent Secured Images is a WordPress plugin by michederoide using jQuery and JavaScript, as well as CSS3, to secure your images a little bit more.
The plugin will replace your image with a transparent image and set your image, you want to show to the user, as background image of the container. When the user now tries to copy the url of the image or the picture itself, he will only get the transparent png file.
AUTHOR NOTE: It is NOT possible to completely secure your images since all browsers have to get them in order to show them your users, but we do a little approach to secured pictures.
Download: http://wordpress.org/extend/plugins/transparency-secured-images/
