Patent ID: 7769766
Filing Date: 2010-08-03
Classification: G06F

Abstract:
1. A method comprising: receiving a user request to access a web page; converting a domain name of the web page into an identifier of the web page, the identifier being different from an Universal Resource Locator (URL) and an Internet Protocol (IP) address of the web page; generating a content rating domain name system (CR DNS) request in response to the user request, the CR DNS request including the converted domain name; distinguishing the CR DNS request from standard DNS requests by the converted domain name; in response to the user request, sending the CR DNS request to a first one of a plurality of DNS servers from a content filtering client to get content rating information of the web page using the identifier, wherein the first one DNS server forwards the CR DNS request to a second one of the plurality of DNS servers if the first one DNS server does not have the content rating information cached; receiving from the first one DNS server a DNS response containing the content rating information to the content filtering client; and blocking the user from accessing the web page if the content rating information of the web page is in a predetermined category.