"x.com" ve "y.com" yerine istediğin alan adlarını yazman yeterli.
RewriteEngine on
RewriteCond %{HTTP_REFERER} !^http://x.com/.*$ [NC]
RewriteCond %{HTTP_REFERER} !^http://x.com$ [NC]
RewriteCond %{HTTP_REFERER} !^http://y.com/.*$ [NC]
RewriteCond %{HTTP_REFERER} !^http://y.com$ [NC]
RewriteCond %{HTTP_REFERER} !^http://www.x.com/.*$ [NC]
RewriteCond %{HTTP_REFERER} !^http://www.x.com$ [NC]
RewriteCond %{HTTP_REFERER} !^http://www.y.com/.*$ [NC]
RewriteCond %{HTTP_REFERER} !^http://www.y.com$ [NC]
RewriteRule .*\.(flv)$ http://x.com [R,NC]