SetEnvIfNoCase Referer "^http://.*\.aaa\.com" local_ref
SetEnvIfNoCase Referer ".*\.bbb\.com" local_ref
SetEnvIfNoCase Referer "^$" local_ref
<filesmatch "\.(txt|doc|mp3|zip|rar|jpg|gif)">
Order Allow,Deny
Allow from env=local_ref
</filesmatch>
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