i just thought of something else, i don't know wheather i should say or not, it might turn around and kick me in the *** later or get people ****ed at me if it works but, have you considered makeing a version of the filter for proxies or network routers? If all computers on an intranet or lan connected through a proxies, the filter only needs to be installed once. This would make tampering impossible if it could be done.