How to use .htaccess deny direct download my file

i use this

RewriteRule .*\.(jpg|jpeg|gif|png|bmp|flv|avi)$ - [F,NC]

but still can direct download my file
how do i edit it ?
thank you

 

<FilesMatch "\.(gif|jpg|jpeg|flv|png)$">
Order Allow,Deny
Deny from all
</FilesMatch>

 

i try it
but still can download

 

because i also use nginx
so i still can download my file
when i remove nginx
this setup can work
but if i want let all can't download,only xxx.com can download
what can i do ?
thank you

 

Seems like rules from your access file are not being applied. Please provide the the full definition of appropriate Directory directive from your server's configuration.

 

in this file
i can deny download
but i want xxx.com
can downlod my file
what can i do

 

In nginx configuration file:

location ~* ^.+\.(flv|jpg|jpeg|png)$ {
root <your_direcrory_with_stuff>
allow from xxx.com
deny from all
}