Problems with a .htaccess file

I have the following code:
RewriteEngine on
RewriteCond %{HTTP_REFERER} !^$
RewriteCond %{HTTP_REFERER} !^http://mydomain.com/.*$ [NC]
RewriteCond %{HTTP_REFERER} !^http://www.mydomain.com/.*$ [NC]
RewriteRule .*\.(avi|AVI|gif|GIF|jpg|JPG)$ - [F]

and i want to protect my movies so they dont be hot link.
But when i upload this i can't download the movies.
Any solutions??

 

 

 

 

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