The methods and systems of the invention utilize limited data to yield information about the validity of any given interaction with a website. Once validity information is available, an operator can determine whether or not to continue offering interactions to a given user. The determination could also...http://www.google.com.tw/patents/US7136860?utm_source=gb-gplus-share專利 US7136860 - System and method to determine the validity of an interaction on a network
