Opinion of Rehnquist, C. J.
available than in making book selections. Ibid. We do not find this distinction constitutionally relevant. A library's failure to make quality-based judgments about all the material it furnishes from the Web does not somehow taint the judgments it does make. A library's need to exercise judgment in making collection decisions depends on its traditional role in identifying suitable and worthwhile material; it is no less entitled to play that role when it collects material from the Internet than when it collects material from any other source. Most libraries already exclude pornography from their print collections because they deem it inappropriate for inclusion. We do not subject these decisions to heightened scrutiny; it would make little sense to treat libraries' judgments to block online pornography any differently, when these judgments are made for just the same reason.
Moreover, because of the vast quantity of material on the Internet and the rapid pace at which it changes, libraries cannot possibly segregate, item by item, all the Internet material that is appropriate for inclusion from all that is not. While a library could limit its Internet collection to just those sites it found worthwhile, it could do so only at the cost of excluding an enormous amount of valuable information that it lacks the capacity to review. Given that tradeoff, it is entirely reasonable for public libraries to reject that approach and instead exclude certain categories of content, without making individualized judgments that everything they do make available has requisite and appropriate quality.
Like the District Court, the dissents fault the tendency of filtering software to "overblock"—that is, to erroneously block access to constitutionally protected speech that falls outside the categories that software users intend to block. See post, at 221-222 (opinion of Stevens, J.); post, at 233-234 (opinion of Souter, J.). Due to the software's limitations, "[m]any erroneously blocked [Web] pages contain contentPage: Index Previous 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 Next
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