From EZP Knowledge Base

Hot link protection prevents other websites from directly linking to files on your website. Other sites will still be able to link to any file type that you don’t specify (ie. html files). An example of hot linking would be using an img tag to display an image from your site on someone else's website. The end result is that the other site is stealing your bandwidth and you are receiving no benefit. To enable / disable hot link protection, please do the following:

• Login to cPanel!
• Click Hotlink Protection (under the "Security" heading)

• Make sure the domain name you wish to protect is in the box below “Url's to Allow Access:”

• Ensure the file extensions you wish to block access for are listed in the box under the heading "Block direct access for these extensions". By default only jpg, jpeg, gif, ping and bmp are protected. You may wish to add some other common file extensions such as .wmv, etc. You should allow .html, .php, etc.

• If you check the box to the left of “Allow direct requests“, it will allow direct requests. This means if someone was to type the url to the file into their browser directly, the file would display properly and wouldn't be blocked.

• You can specify a URL to redirect the browser to by entering it into the box under the heading "Redirect request to this URL".

• Click Submit.