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Blogger Cory Doctorow told protestors it would be "vastly disproportionate [to] disconnect entire households because of one person downloading naughty content".
"Even if those [downloaders] happened to be guilty, I think that would be disproportionate," Doctorow said, adding that full scrutiny of the bill would be "our best chance for a free and open society".
ZDNet UK asked Doctorow whether he thought the protest would make a difference. "All of these things make a difference, whether in the short term or the long term," he said, adding that it was "crazy" to have to ask MPs to "show up for work and talk about the law before they pass it".
Bridget Fox, the Liberal Democrat candidate for the Islington South and Finsbury constituency, said she was "delighted" that her party had, at its recent conference, almost unanimously backed her motion to safeguard internet freedom.
She told protestors: "When we see our freedoms being killed by this government, Liberal Democrats are aggrieved. We are angry, but we will never accept it."
Asked by ZDNet UK whether she believed the protest would have any influence on the government's decision to push the bill through at speed, she said it was "a very good time to focus the attention of MPs as we come up to the election".
Fox added that some aspects of the bill would require secondary legislation, and said she hoped to be a member of parliament when that legislation is debated.
"Even if we have to have a further round of fighting on this after the election, we will get a better outcome," Fox said.
Musician Dan Bull rapped his song Dear Mandy, a track addressed to business secretary Peter Mandelson, whose department originated the Digital Economy Bill.