6. The method of claim 1 further comprising determining if the primary URL corresponds to a composite domain name that comprises a trademark.
1. A method implemented at least in part by a computing device, the method comprising: displaying a primary URL; displaying a final destination URL associated with the primary URL; creating an instance of a browser application in a secure environment; extracting client identification information from a Client ID (cid) field in the final destination URL; blocking the final destination URL if the final destination URL contains a particular client ID; and directly visiting the final destination URL using the browser application if the final destination URL does not contain the particular client ID.