The U.K.'s Digital Economy Act may have passed into law, but leading Internet Service Provider Talk Talk has already made clear it will not be fully cooperating with the music industry on anti-piracy measures.

The Act includes provisions for ISPs to write letters to suspected copyright infringers, following a complaint from rights holders. And telecoms regulator Ofcom could introduce technical measures and suspension of accounts, if the letter-writing does not make an impact on file-sharing.

There are also measures to allow for the blocking of copyright-infringing Web sites after a court ruling, although this will require further parliamentary scrutiny and consultation.

Talk Talk, with 4 million U.K. customers, has been vocal in its opposition to the anti-piracy measures. Andrew Heaney, executive director of strategy and regulation, said on the Talk Talk blog that while the legislation was in "much better shape" than when first table it still has "many draconian proposals."

He criticized the presumption that those accused of copyright infringement "are guilty unless they can prove themselves innocent and, as in China, the potential for legitimate search engines and Web sites to be blocked."

Heaney added: "This is made all the more appalling by the ability of big music and film companies to influence government and the absence of any proper debate or scrutiny by MPs - only 5% of MPs turned up for the brief debate."

He said that Talk Talk will continue to "battle against these oppressive proposals" during the follow-up process in parliament. And he stressed that file-sharers will simply find ways to mask their IP address.

"After the election we will resume highlighting the substantial dangers inherent in the proposals and that the hoped for benefits in legitimate sales will not materialize as file-sharers will simply switch to other undetectable methods to get content for free," added Heaney.

He did not indicate that Talk Talk will not cooperate on the required code of practice, but did pledge that "unless we are served with a court order we will never surrender a customer's details to rights holders. We are the only major ISP to have taken this stance and we will maintain it."

"If we are instructed to disconnect an account due to alleged copyright infringement we will refuse to do so and tell the rights holders we'll see them in court," he added.