a system and method efficiently and anonymously retrieves large scale web data through a restricted query interface . a number of proxy servers are utilized to permit parallel access to a target web server for processing multiple queries simultaneously . latency in the individual queries is absorbed by the proxy servers . queries that would otherwise appear structured to the target server are assigned to the proxy server in a random fashion , obscuring the structured nature of the queries . the anonymous nature of the queries made by the proxy servers furthermore conceals the identity of the originating server .