SetEnvIF Referer "http://abc.net" pass
SetEnvIF Referer "http://www.abc.net" pass <FilesMatch ".(gif|jpg|png|bmp|zip|tar|rar|alz|a00|ace|jpg|jpeg|txt|GIF|JPG|BMP|ZIP|TAR|RAR|ALZ|A00|ACE|TXT|mp3|MP3|mpeg|MPEG|wav|WAV|asf|ASF|wmv|WMV|swf|SWF|exe|EXE)$">
Order deny,allow
deny from all
allow from env=pass </FilesMatch>
SetEnvIF Referer "http://www.abc.net" pass
<FilesMatch ".(gif|jpg|png|bmp|zip|tar|rar|alz|a00|ace|jpg|jpeg|txt|GIF|JPG|BMP|ZIP|TAR|RAR|ALZ|A00|ACE|TXT|mp3|MP3|mpeg|MPEG|wav|WAV|asf|ASF|wmv|WMV|swf|SWF|exe|EXE)$">
Order deny,allow
deny from all
allow from env=pass
</FilesMatch>