Cite as: 539 U. S. 194 (2003)
Stevens, J., dissenting
The unchallenged findings of fact made by the District Court reveal fundamental defects in the filtering software that is now available or that will be available in the foreseeable future. Because the software relies on key words or phrases to block undesirable sites, it does not have the capacity to exclude a precisely defined category of images. As the District Court explained:
"[T]he 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 'visual depictions.' 20 U. S. C. § 9134(f )(1)(A)(i); 47 U. S. C. § 254(h)(5)(B)(i). Image recognition technology is immature, ineffective, and unlikely to improve substantially in the near future. None of the filtering software companies deposed in this case employs image recognition technology when harvesting or categorizing URLs. Due to the reliance on automated text analysis and the absence of image recognition technology, a Web page with sexually explicit images and no text cannot be harvested using a search engine. This problem is complicated by the fact that Web site publishers may use image files rather than text to represent words, i. e., they may use a file that computers understand to be a picture, like a photograph of a printed word, rather than regular text, making automated review of their textual content impossible. For example, if the Playboy Web site displays its name using a logo rather than regular text, a search engine would not see or recognize the Playboy name in that logo." 201 F. Supp. 2d 401, 431-432 (ED Pa. 2002).
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