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Crossdomain policy file

If the license server is hosted on a different domain than the video playback SWF, then a cross-domain policy file (crossdomain.xml) is necessary to allow the SWF to request licenses from the license server. A cross-domain policy file is an XML file that provides a way for the server to indicate that its data and documents are available to SWF files served from other domains. Any SWF file served from a domain specified in the license server's cross-domain policy file is permitted to access data or assets from that license server.
Adobe recommends that developers follow best practices when deploying the cross-domain policy file by only allowing trusted domains to access the license server and limiting the access to the license sub-directory on the web server.
For more information on cross-domain policy files, please see the following locations: