"They pass through our ad servers for accounting purposes.
Unless you can tell us the url for the underlying ad, there's not much we can do.
I realize that there is a difference between maintaining your software infrastructure and policing what is being put in those ads by outside parties. But perhaps you can point out to whoever is in charge of selling the ads and collecting the money, that they may want to make it their business to know just what the ad server is pointing to, rather than placing that responsibility with your users.
Not wanting to cause any trouble here, it's just a thought.
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