Hotlinking is when another web site owner links directly to one or more of your images or multimedia files and includes it on their web page. Not only is this theft of your intellectual property, you are paying for the bandwidth used by that site. Refer to this article for more information on hotlinking.
CPanel can prevent hotlinking by only allowing named sites (such as your own web site) to access files on your site.
To prevent hotlinking:
Click on the HotLink Protection button on the home page.
Enter any other addresses that you will allow to access your site other than the provided defaults in the central area.
Enter the protected extensions in the Extensions to allow field. Make sure you separate each extension with a comma.
Enter the address to redirect any hotlinking to in the Url to Redirect to field.
Click on the Allow direct requests tick box if you want to allow direct URL access to non-HTML files, such as images.
Click on the Activate button.