I am already using DNS filtering to block porn websites but I still need to block porn content from all sites where not all content is porn. It would be a shame to have to block the whole site along with their legit content just to lose the porn. An example would be a torrent site, I would like to use a custom list of keywords to filter away torrents with, say, xxx in their titles. What can I use to block content using a custom list of keywords from all sites? Extra points for a method that I can password protect and throw away the password or other locking method, to make it cumbersome to circumvent.