To protect a website from bandwidth stealing :-
1) Login to Plesk control panel.
2) Go to Home > Hotlink Protection.
3) Click Switch On to enable the protection from hotlinking.
4) Specify the extensions of files you wish to be protected from hotlinking
(for example, jpg, bmp, and so on) in the Protected files extensions field.
When listing several file extensions, separate them with spaces.
5) Click OK.
