human
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
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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 Web site's proprietor or some other third party informs the user of the site's URL. Some Web sites, for example, send out mass email advertisements containing the site's URL, the spamming process we have described above. Second, the search engines that software companies use for harvesting are able to search text only, not images. This is of critical importance, because CIPA, by its own terms, covers only