A system and method for authenticating users based on personal information. The personal information may include age-related data where the users are interested in receiving age-restricted content. The personal information may include an address and a permission request is sent to the address. Biometric...http://www.google.com.tw/patents/US7373671?utm_source=gb-gplus-share專利 US7373671 - Method and system for user information verification
