Hollywood has helped to get The Pirate Bay blocked in many countries, but not on its home turf. There are now various signs that this may change in the near future. Among other things, the MPAA has conducted internal research to show that site blocking is rather effective.

Website blocking has become one of the favorite anti-piracy tools of the entertainment industries in recent years.

The UK is a leader on this front, with the High Court ordering local ISPs to block access to dozens of popular file-sharing sites, including The Pirate Bay and KickassTorrents.

Not everyone is equally excited about these measures and researchers have called their effectiveness into question. This prompted a Dutch court to lift The Pirate Bay blockade a few months ago. The MPAA, however, hopes to change the tide and prove these researchers wrong.

Earlier today Hollywood’s anti-piracy wish list was revealed through a leaked draft various copyright groups plan to submit to the Australian Government. Buried deep in the report is a rather intriguing statement that refers to internal MPAA research regarding website blockades.

“Recent research of the effectiveness of site blocking orders in the UK found that visits to infringing sites blocked declined by more than 90% in total during the measurement period or by 74.5% when proxy sites are included,” it reads.

MPAA internal research

In other words, MPAA’s own data shows that website blockades do help to deter piracy. Without further details on the methodology it’s hard to evaluate the findings, other than to say that they conflict with previous results.

But there is perhaps an even more interesting angle to the passage than the results themselves.

Why would the MPAA take an interest in the UK blockades when Hollywood has its own anti-piracy outfit (FACT) there? Could it be that the MPAA is planning to push for website blockades in the United States?

This is not the first sign to point in that direction. Two months ago MPAA boss Chris Dodd said that ISP blockades are one of the most effective anti-tools available.

Combine the above with the fact that the United States is by far the biggest traffic source for The Pirate Bay, and slowly the pieces of the puzzle begin to fall into place.

It seems only a matter of time before the MPAA makes a move towards website blocking in the United States. Whether that’s through a voluntary agreement or via the courts, something is bound to happen.