Free speech and due process are key concerns regarding DNS blocking, particularly in the United States.
According to an article in Network World magazine, "Just about universally, the people responsible for the technical development and operation of the Internet have said that the DNS-blocking proposals would break vital Internet technology while at the same time being entirely ineffectual against people who are serious about violating copyright laws and largely ineffectual against those who do so casually.
"[5] They go on to claim that politicians who support this type of legislation are motivated by pressure from lobbyists and donors to their campaigns.
Google's chairman, Eric Schmidt, is quoted saying "I would be very, very careful if I were a government about arbitrarily [implementing] simple solutions to complex problems" in reference to DNS blocking and the PIPA bill.
In fact, within two months of the legislation being introduced there were browser plug-ins released that enable users to resolve blocked domains.