You don't filter anything. You offer convenient low-price legal content. Also, I actually liked Comcast's idea of setting a data transfer limit for each month. This will effectively snuff out those who are using their internet connection to download and upload very large amounts of illegal videos every month.
I don't really like bandwidth limit. I got it and it can be annoying when you went past your cap and they throttle your traffic to be more slower than 128KB/s. Although their are unmetered sites.