human
that may be used to attempt to comply with CIPA. There are numerous filtering software products available commercially. Three network-based filtering products – SurfControl's Cyber Patrol, N2H2's Bess/i2100, and Secure Computing's SmartFilter – currently have the lion's share of the public library market. The parties in this case deposed representatives from these three companies. Websense, another network-based blocking product, is also currently used in the public library market, and was discussed at trial. Filtering software may be installed either on an individual computer or on a computer network. Network-based filtering software products are designed for use on a network of computers and funnel requests for Internet content through a centralized network device. Of the various commercially available blocking products, network-based products are the ones generally marketed to institutions, such as public libraries, that provide Internet access through multiple terminals. Filtering programs function in a fairly simple way. When an Internet user requests access to a certain Web site or page, either by entering a domain name or IP address into a Web browser, or by clicking on a link, the filtering software checks that domain name or IP address against a previously compiled