Rep. Zoe Lofgren, the California Democrat whose district includes the heart of Silicon Valley, is preparing to lead congressional opposition to the new Stop Online Piracy Act.

The antipiracy legislation, introduced yesterday in the House of Representatives to the applause of lobbyists for Hollywood and other large content holders, is designed to make allegedly copyright-infringing Web sites, sometimes called "rogue" Web sites, virtually disappear from the Internet.

"I'm still reviewing the legislation, but from what I've already read, this would mean the end of the Internet as we know it," Lofgren told CNET.