Plesk Panel
To protect a website from hotlinking
Step. 1. Login to Plesk control panel, and go to "WebSites and Domains".
Step. 2. Click on "Show Advanced Operations".
Step. 3. Click on "Hotlink Protection".
Step. 4. Click Switch On to enable the protection from hotlinking.
Step. 5. Specify the extensions of files that you want to protect from hotlinking (for example, jpg, bmp, and so on) in the 'Protected files extensions' field (1). When listing several file extensions, separate them with white spaces. If you want to allow direct linking to your files from certain sites, type the website addresses into the 'Addresses of friendly websites' field(2), and click Add(3). Finally click on "OK" button (4)