sneaky TV style flash ads

[lnminente]

I saw there http://ad.doubleclick.net/crossdomain.xml, and thinked could be interesting writing a filter to redirect crossdomain.xml from adsources to a crossdomain.xml local file. Someone know the good parameters in this file for doing this?

The standard is: http://www.adobe.com/xml/dtds/cross-domain-policy.dtd