Policy File Request To Connect Custom IRC Flash Overlay

I think I need twitch to host this file on the domain irc.twitch.tv:

<?xml version="1.0"?>
<!DOCTYPE cross-domain-policy SYSTEM "http://www.macromedia.com/xml/dtds/cross-domain-policy.dtd">
<cross-domain-policy>
	<allow-access-from domain="*" />
	<site-control permitted-cross-domain-policies="master-only"/>
</cross-domain-policy>

on port : 843

Please can a twitch developer get back to me on this: I have asked a professional actionscript programmer and he seems to think that this won’t create any security problems for anyone.