Although most of the internet is available for free, some software companies (and possibly many lawyers) stand to make megabucks from the use of filtering software, at least if Congress has its way.

Programs designed to selectively block users from accessing sites deemed potentially harmful or inappropriate have been around for several years, and many school districts have opted to install them as one way of reducing potential liability for allowing students to wander into the murky depths of the dark side of the internet. The pols on Capitol Hill have felt the public pulse...

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