Try this to block realplayer with Apache:
SetEnvIfNoCase User-Agent "^RealPlayer" bad_client
<Directory "/your/streaming/files/*">
Order allow,deny
Allow from All
Deny from env=bad_client
</Directory>
Try this to block realplayer with Apache:
SetEnvIfNoCase User-Agent "^RealPlayer" bad_client
<Directory "/your/streaming/files/*">
Order allow,deny
Allow from All
Deny from env=bad_client
</Directory>