What's a big deal to protect files from hotlinking???
htaccess:
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RewriteEngine on
RewriteCond %{HTTP_REFERER} !.*
www.yourdomain.com.* [NC]
RewriteRule .*\.[ext1|ext2|ext3|...] - [NC,F]
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where ext1, ext2, ext3 - extentions of files you don't want to be hotlinked (jpg, avi, mov, and so on)
This "howto" can be found in internet in 5 minutes.