by Jim » Wed Sep 11, 2013 6:24 pm
A web search should turn up different methods of attempting to do that.
But anyone with a little knowledge of how a browser works would be able to get around it. For example in the FireFox and Chrome browsers if you click on File in the main menu there is a Save Page As option that saves everything from the page including images, html, style sheets, javascript etc. Then all they need to do is go to the directory on their computer where the information was downloaded and grab the images.
A better thing to do is size the images so they look ok on the web but would be small enough that they wouldn't be of a high enough quality to print. Also you can watermark the images in such a way that they won't be usable if they do download them. Some sites also embed code in the image itself that can be read by special applications. Then they have a service that scans the web for their images by checking the images for the embedded code. If they find any image that they haven't authorized they prosecute the site.