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Crossdoman Security - read below for update instructions
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The Adobe Flash Player contains a crossdomain security mechanism that denies certain operations on files
that are loaded from a different domain than the player.swf.:


developer.longtailvideo.com/trac/wiki/FlashSecurity

all you have to do is to upload to yours web root server where you put, your files (xml and flv) a crossdomain.xml file

Code:
<?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="*" />
</cross-domain-policy>