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<files wp-config.php>
order allow,deny
deny from all
</files>

# directory browsing
Options All -Indexes

RewriteEngine on
RewriteCond %{HTTP_REFERER} !^$
RewriteCond %{HTTP_REFERER} !^http(s)?://(www\.)?your-domain.com [NC]
RewriteRule \.(jpg|jpeg|png|gif)$ - [NC,F,L]