Internet traffic in Sweden fell by 33% as the country's new anti-piracy law came into effect, reports suggest.

Sweden's new policy - the Local IPRED law - allows copyright holders to force internet service providers (ISP) to reveal details of users sharing files.

Popular BitTorrent sharing site, The Pirate Bay, is also based in Sweden.

The new law, which is based on the European Union's Intellectual Property Rights Enforcement Directive (IPRED), allows copyright holders to obtain a court order forcing ISPs to provide the IP addresses identifying which computers have been sharing copyrighted material.

The drop in traffic is expected to be temporary as users change software to better hide their ip addresses and identities on file sharing sites.