Our leading product is CardianAnywhere. It uses compulsary VPN tunnel technology to proctects students from K-12 from accessing inappropiate content off campus anywhere in the world.
CardianAnywhere installs a small agent on students' PCs or MACs. It creates a VPN tunnel to the on campus network. This simple solution ensures all students' computers virtually always "on campus" 24/7, no matter where the students are physically.
Since most schools already have some filter/firewall in place, this solution is the simplest way to integrate with existing infrustructure, however it is the most effective one.
Other solutions on the market either directly use a client software to do filter and firewall or send every URL to a server to check the polacies base on that URL. All these solutions are harder to manage and less effective than GardianAnywhere solution.