Once censorship is in place , politicians will think of plenty more things they can ban . This is what bothered me about Cleanfeed , BT ' s anti illegal pornography blocking system the start of active content censorship in the UKintroduced in 2004 . You may think Cleanfeed is designed to prevent viewing of abuse images , that ' s how it ' s sold to the public it is not . It is designed to prevent accidental viewing of abuse images . So it does nothing to stop actual criminals , it wasn ' t designed to . The huge importance of Cleanfeed was not stopping criminals but crossing the Rubicon from a UK where ISPs did not examine and censor your traffic to one where it did . And of course , once the principle of censorship had been established , groups started applying it to other areas like copyright . I felt we ' d end up here back in 2004 .