clipped from news.yahoo.com Hidden dangers in visiting porn sites SAN JOSE, Calif. - Online pornography hunters' Internet adventures are already fraught with danger from malicious code many porn sites use to commandeer visitors' machines or steal personal data. Now comes a scheme some researchers say amounts to extortion: One site's threat to disable visitors' computers with relentless pop-up ads if they don't pay for a subscription they were automatically signed up for after a free trial. affect people who visit the Web site and download software to access a free three-day trial membership. download includes code enerates a stream of pop-up windows, when the user is online and offline, demanding payment of roughly $80 for 90 days The windows stay open up to 10 minutes and appear once a day. They also reappear if the computer is rebooted.