Web sites and pages to  harvest  for classification.  These methods include: entering

certain key words into search engines; following links from a variety of online directories

(e.g., generalized directories like Yahoo or various specialized directories, such as those

that provide links to sexually explicit content); reviewing lists of newly registered domain

names; buying or licensing lists of URLs from third parties;  mining  access logs

maintained by their customers; and reviewing other submissions from customers and the

public.  The goal of each of these methods is to identify as many URLs as possible that

are likely to contain content that falls within the filtering companies' category definitions. 

The first method, entering certain keywords into commercial search engines,

suffers from several limitations.  First, the Web pages that may be  harvested  through

this method are limited to those pages that search engines have already identified. 

However, as noted above, a substantial portion of the Web is not even theoretically

indexable (because it is not linked to by any previously known page), and only

approximately 50% of the pages that are theoretically indexable have actually been

indexed by search engines.  We are satisfied that the remainder of the indexable Web,

and the vast  Deep Web,  which cannot currently be indexed, includes materials that

meet CIPA's categories of visual depictions that are obscene, child pornography, and

harmful to minors.  These portions of the Web cannot presently be harvested through the

methods that filtering software companies use (except through reporting by customers or

by observing users' log files), because they are not linked to other known pages.  A user

can, however, gain access to a Web site in the unindexed Web or the Deep Web if the

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