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I came across cross-domain xml files on Vimeo and found that there are different policies on different directories.
One on https://vimeo.com/settings/crossdomain.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE cross-domain-policy SYSTEM "http://www.adobe.com/xml/dtds/cross-domain-policy.dtd">
<cross-domain-policy>
    <allow-access-from domain="none" secure="false"/>
    <allow-http-request-headers-from domain="none" headers="*"/>
</cross-domain-policy>

Another on https://vimeo.com/crossdomain.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE cross-domain-policy SYSTEM "http://www.adobe.com/xml/dtds/cross-domain-policy.dtd">
<cross-domain-policy>
    <site-control permitted-cross-domain-policies="by-content-type" />
</cross-domain-policy>  

I want to know what factors will decide which policy will be prioritized? Can we say it is an overly-permissive crossdomain xml file?(seeing the first one)
Also, what does this line mean?

<site-control permitted-cross-domain-policies="by-content-type" />

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