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I believe Blockscript is filtering the HTTP input stream, parsing out IP's, doing a lookup on them, and doing a redirect to a designated page for positively identified IP's. The lookup also includes IP's of proxies and other troublesome sources. They claim to have ~millions of such IP's, updated daily.
They claim to have ~millions of such IP's, updated daily.is "porkys" ;-) especially this bit =>"updated daily"..even the paid data base at maxmind and the live version " web version" doesn't update millions of IPs "daily"..