Hotlinking is a serious problem. Aside from increasing your bandwidth costs, hotlinking may undermine the revenue source of your files.
Universal CDN offers several ways to protect your resources from hotlinking. You can protect your resources from hotlinking by using the following methods:
In addition, you can restrict or limit visitors in certain countries from accessing your resources or limit the access to your CDN zone by an IP address/IP network. You can read more here:
Limit Access by a Single IP Address / IP Network
For additional information on the available methods, click on the provided links above.