The American filmlobbyclub MPAA is considering to the dns system to use to piraterijsites to block. Internet service providers would be covered by legal coercion dns requests for piraterijsites can reject, making them for many people not to visit.
It turns out that that according to The Equation of e-mails that were leaked after the Sony hack. It is not clear how concrete the plans are, but the MPAA writes in internal e-mails that providers could be threatened with legal consequences if they do not contribute to the blocking of websites in the dns. That the MPAA are in favour of blocking piraterijsites is already known.
The MPAA acknowledges in the internal e-mails that the measure is not one hundred percent effective, because downloaders with more than average technical knowledge and download sites still will be able to achieve, for example, by an alternative dns server or a vpn connection to use. The blockade would be casual downloaders, however, can keep on searching for download sites, thinks the MPAA.
Critics point out that with the blockade, the integrity of the dns system is compromised. Also, that would be the roll-out of dnssec hinder: dnssec ensures that there is no man in the middle attack can take place which is tampered with the answers that a dns server provides.
In the Netherlands, had multiple providers, incidentally, the only time The Pirate Bay block, both at the dns and ip level. Now that blockade is lifted, all is Brein, in which the case is filed, that the court of cassation gone. Thus, it is possible that the block is re-entered.