The Censorware Project

Blacklisted by Cyber Patrol

From Ada to Yoyo

A report from The Censorware Project


Cyber Patrol is software to filter the internet and block content based on one or more categories: nudity, alcohol, etc.

Software of this type is used not for people to protect themselves, but for authority figures to control what others may view. Cyber Patrol targets many markets: businesses, schools, proxy servers, and even governments. (Cyber Patrol partners with Prodigy to provide censored internet access to China.) Because of this, it has earned the epithet "Censorware."

And because nearly all existing products refuse to reveal the contents of their lists, calling them trade secrets, those lists have earned the epithet "Blacklists."

DejaNews blockedWith a hundred million pages already on the web, and thousands of new domains being added every day, how can any one group hope to find all the material which should be blocked, or even most of it? The human resources required just to examine new sites on the web are staggering, not to mention the additional task of reexamining existing material.

In the race to advertise a larger and larger database, it is easy to forget that errors made in haste may stay on the secret list for months, or years, or may never be found. There are over 50,000 entries in the CyberNOT database, and CyberPatrol does not notify the sites it blocks.

This report examines some of the thousands of sites which Cyber Patrol blocks in their entirety, against two criteria: first, that blocking should be accurate (e.g. a site should not be blocked as sexually explicit if it has no such content), and second, that blocking should not be overbroad (e.g. because site A has explicit material, site B should not be blocked based on a similarity of name or sharing a computer).

Our conclusion is that Cyber Patrol blocks a great many sites which do not deserve to be, and that furthermore, looking at past reports of the product's accuracy, fixing these errors is a low priority.

In this report, we do not compare Cyber Patrol against other products of its type. In fact, it may be one of the better censorware programs (it has certainly won enough awards). We take no position on its value relative to competing products.

Reporters: note that the list of blocked sites in this report has been verified by independent, unaffiliated journalists in advance of publication. Please contact the authors for more information. The press release associated with these webpages is also available.

Ada and Yoyo are two sites blocked by Cyber Patrol. Details are in the Introduction.

Update: as we predicted, most of the blocks we describe in this report were quickly unblocked by The Learning Company. We were surprised to learn that eight or ten of the sites we mentioned were not unblocked, though they clearly should have been, and that the hundreds of newsgroups were not even reviewed. Our aftermath update is now available. 12/25/97

Several members of the volunteer organization Peacefire were instrumental in helping to prepare our data. We owe thanks to Nicole Carlson, Reid Conti, Lee Dia, Benjamin Jenkins, Seth Schoen, Ross Sieber, and our other (anonymous) assistants.

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