There are two types of "scrapers" out there - the people who think everything on the net is free and don't have a clue about anything....you can put code in to disable things like right clicking on a picture to save it. You will stop the clueless folks....
The second is going to have tools that can basically copy almost anything (except databases if they are secure). There isn't much you can do to stop them, other than identifying people that have stolen you code, information and/or pictures, and sending them a cease and desist letter, and if they continue to use your copyrighted material - then you can sue them.