How To Prevent Image Copying
Chapter 4: Checking The Referring PageAnother idea to prevent copying (or at least make it annoying and bothersome) is to use an anti-leech script to prevent linking to your images.
Anti-leech scripts are primarily intended to prevent people hot-linking to your images. What they do is only send the image to the user's browser if the image is accessed from a URL (web page or web site) that you specify.
In principle you can use this to prevent people simply typing in the URL of your images into your browser. For example, if you have an image on your web site called mypicture.jpg a user might be able to see if they visit your web page http://www.yourdomainname.com/yourpage.html but they won't be able to see if they type into their browser (or link to) http://www.yourdomainname.com/mypicture.jpg.
While anti-leech scripts are great for preventing hot-linking and protecting your site's bandwidth, they are not so good for preventing copying.
This is because anti-leech scripts rely on the Referring Page field sent by users' web browsers to identify which page the user is accessing your images from. But, sometimes web browsers do not correctly fill out this field and instead leave it blank.
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