Dell SonicWALL Content Filtering Services Premium enforces protection and productivity policies for businesses, schools, and libraries to reduce privacy risks while minimizing administration overhead. CFS Premium provides network administrators with greater control by automatically and transparently enforcing acceptable use policies. SonicWALL CFS Premium gives administrators the flexibility to enforce content filtering on zones as well as custom content filtering policies for groups of users on the network. For example, a school can create one policy for teachers and another for students. SonicWALL CFS Premium utilizes a dynamic database of millions of URLs, IP addresses, and domains to block 56 categories of objectionable, inappropriate or unproductive web content. At the core of CFS Premium is a rating architecture that cross references all web sites against the database at worldwide Dell SonicWALL co-location facilities.A rating is returned to the Dell SonicWALL security appliance and then compared to the content filtering policy established by the administrator. The web site request is either allowed through or a web page is generated by the Dell SonicWALL security appliance informing the user that the site has been blocked according to policy. With Dell SonicWALL CFS Premium, network administrators have a flexible tool to provide comprehensive filtering based on keywords, time of day, trusted and forbidden domain designations, and file types such as Cookies, Java and ActiveX. CFS Premium automatically updates the filters, making maintenance substantially simpler and less time consuming. SonicWALL CFS Premium can also be customized to add or remove specific URLs from the blocked list and to block specific keywords. When a user attempts to access a site that is blocked by the Dell SonicWALL security appliance, a customized message is displayed on the user's screen.