Internet filtering software, further, is here. As of this writing, the Platform for Internet Content Selection (PICS) working group has developed a common language for Internet rating systems, making it much easier to create and market such ratings.6 Already, two heavily promoted ratings systems (SafeSurf and RSACi) allow content providers to rate their own World Wide Web sites in a sophisticated manner. Microsoft's World Wide Web browser incorporates a feature called Content Advisor that will block Web sites in accordance with the rules of any PICS-compliant ratings system, including SafeSurf and RSACi. 7 Stand-alone blocking software-marketed under such trademarks as SurfWatch, Cyber Patrol, CYBERSirter, KinderGuard, Net Nanny, and Parental Guidance-is gaining increasing sophistication and popularity.