HotLinking protection

HI all

I have a problem ..lot of ppl hotlinking my mp3 files.
I am using this code to preventing from hotlinking

*************************************************
RewriteEngine on
RewriteCond %{HTTP_REFERER} !^$
RewriteCond %{HTTP_REFERER} !^http://(www\.)?mydomain.com(/).*$ [NC]
RewriteCond %{HTTP_REFERER} !^http://(www\.)?mydomain.com/mp3(/).*$ [NC]
RewriteCond %{HTTP_REFERER} !^http://(www\.)?mydomain.com/mp3z(/).*$ [NC]
RewriteRule .*\.(mp3|jpg|jpeg|bmp|gif)$ http://www.mydomain.com [R,NC]
*****************************************

It works fine ...it blocking when ppl click on a hot link..but when they right clcik on a hotlink and choose "Save target as" they can download the mp3 ..how can i stop this..i ampaying a lot of money for bandwidth. i need help ASAP.

thanks

 

 

 

 

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