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By Larry Magid

There are lots of companies that build Internet filtering products and while most do a pretty good job of keeping kids away from porn, none are perfect.  MetaCert,which claims to have labelled nearly 630 million pornographic web pages, isn’t perfect either but its CEO Paul Walsh claims that it has less than a 0.3% error rate.

The company has software, called “crawlers,” that scour the web constantly looking for porn. If it finds a site that meets its criteria, it adds it to the list but if anyone suspects that it’s not really a porn site, they can submit it for review and have it removed if it got there by accident.

The company has a number of products including plug-ins for Firefox and Chrome and its own DNS (domain name service) server that can block porn on all devices connected to your home network. It’s also about to release its own porn-free browser for the iPad called Olly. Parents can make Olly available to their kids but restrict access to Apple’s unfiltered Safari browser for themselves only.

Click here for more from Larry’s CNET blog post

Listen to interview with MetaCert CEO Paul Walsh