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To receive E-rate discounts, a library must also certify that filtering software is in operation during adult use of the Internet. More specifically, with respect to adults, a library must certify that it is "enforcing a policy of Internet safety that includes the operation of a technology protection measure with respect to any of its computers with Internet access that protects against access through such computers to visual depictions that are (I) obscene; or (II) child pornography," and that it is "enforcing the operation of such technology protection measure during any use of such computers." CIPA Sec. 1721(b) (codified at 47 U.S.C. Sec. 254(h)(6)(C)). Interpreting the statutory terms "any use," the FCC has concluded that "CIPA makes no distinction between computers used only by staff and those accessible to the public." In re Federal-State Joint Board on Universal Service: Children's Internet Protection Act, CC Docket No. 96–45, Report and Order, FCC 01–120, 30 (Apr. 5, 2001). With respect to libraries receiving E-rate discounts, CIPA further specifies that "[a]n administrator, supervisor, or other person authorized by the certifying authority … may disable the technology protection measure concerned, during use by an adult, to enable access for bona fide research or other lawful purpose." CIPA Sec.1721(b) (codified at 47 U.S.C. Sec. 254(h)(6)(D)). 2. CIPA's Amendments to the LSTA Program Section 1712 of CIPA amends the Museum and Library Services Act (20 U.S.C. Sec. 9134(f)) to provide that no funds made available under the Act "may be used to purchase computers used to access the Internet, or to pay for direct costs associated with accessing the Internet," unless such library "has in place" and is enforcing "a policy of Internet safety that includes the operation of a technology protection measure with respect to any of its computers with Internet access that protects against access through such computers to visual depictions" that are "obscene" or "child pornography," and, when the computers are in use by minors, also protects against access to visual depictions that are "harmful to minors." CIPA Sec. 1712 (codified at 20 U.S.C. Sec. 9134(f)(1)). Section 1712 contains definitions of "technology protection measure," "obscene," "child pornography," and "harmful to minors," that are substantially similar to those found in the provisions governing the E-rate program. CIPA Sec. 1712 (codified at 20 U.S.C. Sec. 9134(f)(7)); see also supra note 2.

As under the E-rate program, "an administrator, supervisor or other authority may disable a technology protection measure … to enable access for bona fide research or other lawful purposes." CIPA Sec. 1712 (codified at 20 U.S.C. Sec. 9134(f)(3)). Whereas CIPA's amendments to the E-rate program permit disabling for bona fide research or other lawful purposes only during adult use, the LSTA provision permits disabling for both adults and minors. 2. Identity of the Plaintiffs 1. Library and Library Association Plaintiffs Plaintiffs American Library Association, Alaska Library Association, California Library Association, Connecticut Library Association, Freedom to Read Foundation, Maine Library Association, New England Library Association, New York Library Association, and Wisconsin Library Association are non-profit organizations whose members include public libraries that receive either E-rate discounts or LSTA funds for the provision of Internet access. Because it is a prerequisite to associational standing, we note that the interests that these organizations seek to protect in this litigation are central to their raison d'ętre.

Plaintiffs Fort Vancouver Regional Library District, in southwest Washington state; Multnomah County Public Library, in Multnomah County, Oregon; Norfolk Public Library System, in Norfolk, Virginia; Santa Cruz Public Library Joint Powers Authority, in Santa Cruz, California; South Central Library System ("SCLS"), centered in Madison, Wisconsin; and the Westchester Library System, in Westchester County, New York, are public library systems with branch offices in their respective localities that provide Internet access to their patrons. The Fort Vancouver Regional Library District, for over three years from 1999–2001, received $135,000 in LSTA grants and $19,500 in E-rate discounts for Internet access. The Multnomah County Public Library received $70,000 in E-rate discounts for Internet access this year, and has applied for $100,000 in E-rate discounts for the upcoming year. The Norfolk Public Library System received $90,000 in E-rate discounts for Internet access this year, and has received a $200,000 LSTA grant to put computer labs in eight of its libraries. The Santa Cruz Public Library Joint Powers Authority received $20,560 in E-rate discounts for Internet access in 2001–02. The SCLS received between $3,000 and $5,000 this year in E-rate discounts for Internet access. The Fort Vancouver Regional Library District Board is a public board whose members are appointed by elected county commissioners. The Multnomah County Library is a county department, whose board is appointed by the county chair and confirmed by the other commissioners. The SCLS is an aggregation of 51 independently governed statutory member public libraries, whose relationship to SCLS is defined by state law. The governing body of the SCLS is the Library Board of Trustees, which consists of 20 members nominated by county executives and ratified by county boards of supervisors. 2. Patron and Patron Association Plaintiffs

Plaintiffs Association of Community Organizations for Reform Now, Friends of the Philadelphia City Institute Library, and the Pennsylvania Alliance for Democracy are nonprofit organizations whose members include individuals who access the Internet at public libraries that receive E-rate discounts or LSTA funds for the provision of public Internet access. We note for the purpose of associational standing that the interests that these organizations seek to protect in this litigation are germane to their purposes. Plaintiffs Emmalyn Rood, Mark Brown, Elizabeth Hrenda, C. Donald Weinberg, Sherron Dixon, by her father and next friend Gordon Dixon, James Geringer, Marnique Tynesha Overby, by her next friend Carolyn C. Williams, William J. Rosenbaum, Carolyn C. Williams, and Quiana Williams, by her mother and next friend Sharon Bernard, are adults and minors who use the Internet at public libraries that, to the best of their knowledge, do not filter patrons' access to the Internet. Several of these plaintiffs do not have Internet access from home. Emmalyn Rood is a sixteen-year-old who uses the Multnomah County Public Library. When she was 13, she used the Internet at the Multnomah County Public Library to research issues relating to her sexual identity. Ms. Rood did not use her home or school computer for this research, in part because she wished her searching to be private. Although the library offered patrons the option of using filtering software, Ms. Rood did not use that option because she had had previous experience with such programs blocking information that was valuable to her, including information relating to gay and lesbian issues.

Plaintiff Mark Brown used the Internet at the Philadelphia Free Library to research breast cancer and reconstructive surgery for his mother who had breast surgery. Mr. Brown's research at the library provided him and his mother with essential information about his mother's medical condition and potential treatments. 3. Web Publisher Plaintiffs Plaintiff Afraid to Ask, Inc., based in Saunderstown, Rhode Island, publishes a health education Web site, www.AfraidtoAsk.com. Dr. Jonathan Bertman, the president and medical director of Afraid to Ask, is a family practice physician in rural Rhode Island and a clinical assistant professor of family medicine at Brown University. AfraidtoAsk.com's mission is to provide detailed information on sensitive health issues, often of a sexual nature, such as sexually transmitted diseases, male and female genitalia, and birth control, sought by people of all ages who would prefer to learn about sensitive health issues anonymously, i.e., they are "afraid to ask." As part of its educational mission, AfraidtoAsk.com often uses graphic images of sexual anatomy to convey information. Its primary audience is teens and young adults. Based on survey data collected on the site, half of the people visiting the site are under 24 years old and a quarter are under 18. AfraidtoAsk.com is blocked by several leading blocking products as containing sexually explicit content.

Plaintiff Alan Guttmacher Institute has a Web site that contains information about its activities and objectives, including its mission to protect the reproductive choices of women and men. Plaintiff Planned Parenthood Federation of America, Inc. ("Planned Parenthood") is a national voluntary organization in the field of reproductive health care. Planned Parenthood owns and operates several Web sites that provide a range of information about reproductive health, from contraception to prevention of sexually transmitted diseases, to finding an abortion provider, and to information about the drug Mifepristone. Plaintiff Safersex.org is a Web site that offers free educational information on how to practice safer sex. Plaintiff Ethan Interactive, Inc., d/b/a Out In America, is an online content provider that owns and operates 64 free Web sites for gay, lesbian, bisexual and transgendered persons worldwide. Plaintiff PlanetOut Corporation is an online content provider for gay, lesbian, bisexual and transgendered persons. Plaintiff the Naturist Action Committee ("NAC") is the nonprofit political arm of the Naturist Society, a private organization that promotes a way of life characterized by the practice of nudity. The NAC Web site provides information about Naturist Society activities and about state and local laws that may affect the rights of Naturists or their ability to practice Naturism, and includes nude photographs of its members.

Plaintiff Wayne L. Parker was the Libertarian candidate in the 2000 U.S. Congressional election for the Fifth District of Mississippi (and is running again in 2002). He publishes a Web site that communicates information about his campaign and that provides information about his political views and the Libertarian Party to the public. Plaintiff Jeffrey Pollock was the Republican candidate in the 2000 U.S. Congressional election for the Third District of Oregon. He operates a Web site that is now promoting his candidacy for Congress in 2002. 3. The Internet 1. Background As we noted at the outset, the Internet is a vast, interactive medium consisting of a decentralized network of computers around the world. The Internet presents low entry barriers to anyone who wishes to provide or distribute information. Unlike television, cable, radio, newspapers, magazines or books, the Internet provides an opportunity for those with access to it to communicate with a worldwide audience at little cost. At least 400 million people use the Internet worldwide, and approximately 143 million Americans were using the Internet as of September 2001. Nat'l Telecomm. & Info. Admin., A Nation Online: How Americans Are Expanding Their Use of the Internet (February 2002), available at http://www.ntia.doc.gov/ntiahome/dn/.

The World Wide Web is a part of the Internet that consists of a network of computers, called "Web servers," that host "pages" of content accessible via the Hypertext Transfer Protocol or "HTTP." Anyone with a computer connected to the Internet can search for and retrieve information stored on Web servers located around the world. Computer users typically access the Web by running a program called a "browser" on their computers. The browser displays, as individual pages on the computer screen, the various types of content found on the Web and lets the user follow the connections built into Web pages called "hypertext links," "hyperlinks," or "links" to additional content. Two popular browsers are Microsoft Internet Explorer and Netscape Navigator. A "Web page" is one or more files a browser graphically assembles to make a viewable whole when a user requests content over the Internet. A Web page may contain a variety of different elements, including text, images, buttons, form fields that the user can fill in, and links to other Web pages. A "Web site" is a term that can be used in several different ways. It may refer to all of the pages and resources available on a particular Web server. It may also refer to all the pages and resources associated with a particular organization, company or person, even if these are located on different servers, or in a subdirectory on a single server shared with other, unrelated sites. Typically, a Web site has as an intended point of entry, a "home page," which includes links to other pages on the same Web site or to pages on other sites. Online discussion groups and chat rooms relating to a variety of subjects are available through many Web sites.

Users may find content on the Web using engines that search for requested keywords. In response to a keyword request, a search engine will display a list of Web sites that may contain relevant content and provide links to those sites. Search engines and directories often return a limited number of sites in their search results (e.g., the Google search engine will return only 2,000 sites in response to a search, even if it has found, for example, 530,000 sites in its index that meet the search criteria). A user may also access content on the Web by typing a URL (Uniform Resource Locator) into the address line of the browser. A URL is an address that points to some resource located on a Web server that is accessible over the Internet. This resource may be a Web site, a Web page, an image, a sound or video file, or other resource. A URL can be either a numeric Internet Protocol or "IP" address, or an alphanumeric "domain name" address. Every Web server connected to the Internet is assigned an IP address. A typical IP address looks like "13.1.64.14." Typing the URL "http://13.1.64.14/" into a browser will bring the user to the Web server that corresponds to that address. For convenience, most Web servers have alphanumeric domain name addresses in addition to IP addresses. For example, typing in "http://www.paed.uscourts.gov" will bring the user to the same Web server as typing in "http://204.170.64.143." Every time a user attempts to access material located on a Web server by entering a domain name address into a Web browser, a request is made to a Domain Name Server, which is a directory of domain names and IP addresses, to "resolve," or translate, the domain name address into an IP address. That IP address is then used to locate the Web server from which content is being requested. A Web site may be accessed by using either its domain name address or its IP address.

A domain name address typically consists of several parts. For example, the alphanumeric URL http://www.paed.uscourts.gov/documents/opinions can be broken down into three parts. The first part is the transfer protocol the computer will use in accessing the content (e.g., "http" for Hypertext Transfer Protocol); next is the name of the host server on which the information is stored (e.g., www.paed.uscourts.gov); and then the name of the particular file or directory on that server (e.g., /documents/opinions). A single Web page may be associated with more than one URL. For example, the URLs http://www.newyorktimes.com and http://www.nytimes.com will both take the user to the New York Times home page. The topmost directory in a Web site is often referred to as that Web site's root directory or root URL. For example, in http://www.paed.uscourts.gov/documents, the root URL is http://www.paed.uscourts.gov. There may be hundreds or thousands of pages under a single root URL, or there may be one or only a few.

There are a number of Web hosting companies that maintain Web sites for other businesses and individuals, which can lead to vast amounts of diverse content being located at the same IP address. Hosting services are offered either for a fee, or in some cases, for free, allowing any individual with Internet access to create a Web site. Some hosting services are provided through the process of "IP-based hosting," where each domain name is assigned a unique IP number. For example, www.baseball.com might map to the IP address "10.3.5.9" and www.XXX.com might map to the IP address "10.0.42.5." Other hosting services are provided through the process of "name-based hosting," where multiple domain name addresses are mapped to a single IP address. If the hosting company were using this method, both www.baseball.com and www.XXX.com could map to a single IP address, e.g., "10.3.5.9." As a result of the "name-based hosting" process, up to tens of thousands of pages with heterogeneous content may share a single IP address. 2. The Indexable Web, the "Deep Web"; Their Size and Rates of Growth and Change

The universe of content on the Web that could be indexed, in theory, by standard search engines is known as the "publicly indexable Web." The publicly indexable Web is limited to those pages that are accessible by following a link from another Web page that is recognized by a search engine. This limitation exists because online indexing techniques used by popular search engines and directories such as Yahoo, Lycos and AltaVista, are based on "spidering" technology, which finds sites to index by following links from site to site in a continuous search for new content. If a Web page or site is not linked by others, then spidering will not discover that page or site.

Furthermore, many larger Web sites contain instructions, through software, that prevent spiders from investigating that site, and therefore the contents of such sites also cannot be indexed using spidering technology. Because of the vast size and decentralized structure of the Web, no search engine or directory indexes all of the content on the publicly indexable Web. We credit current estimates that no more than 50% of the content currently on the publicly indexable Web has been indexed by all search engines and directories combined. No currently available method or combination of methods for collecting URLs can collect the addresses of all URLs on the Web. The portion of the Web that is not theoretically indexable through the use of "spidering" technology, because other Web pages do not link to it, is called the "Deep Web." Such sites or pages can still be made publicly accessible without being made publicly indexable by, for example, using individual or mass emailings (also known as "spam") to distribute the URL to potential readers or customers, or by using types of Web links that cannot be found by spiders but can be seen and used by readers. "Spamming" is a common method of distributing to potential customers links to sexually explicit content that is not indexable. Because the Web is decentralized, it is impossible to say exactly how large it is. A 2000 study estimated a total of 7.1 million unique Web sites, which at the Web's historical rate of growth, would have increased to 11 million unique sites as of September 2001. Estimates of the total number of Web pages vary, but a figure of 2 billion is a reasonable estimate of the number of Web pages that can be reached, in theory, by standard search engines. We need not make a specific finding as to a figure, for by any measure the Web is extremely vast, and it is constantly growing. The indexable Web is growing at a rate of approximately 1.5 million pages per day. The size of the un-indexable Web, or the "Deep Web," while impossible to determine precisely, is estimated to be two to ten times that of the publicly indexable Web.

In addition to growing rapidly, Web pages and sites are constantly being removed, or changing their content. Web sites or pages can change content without changing their domain name addresses or IP addresses. Individual Web pages have an average life span of approximately 90 days. 3. The Amount of Sexually Explicit Material on the Web There is a vast amount of sexually explicit material available via the Internet and the Web. Sexually explicit material on the Internet is easy to access using any public search engine, such as, for example, Google or AltaVista. Although much of the sexually explicit material available on the Web is posted on commercial sites that require viewers to pay in order to gain access to the site, a large number of sexually explicit sites may be accessed for free and without providing any registration information. Most importantly, some Web sites that contain sexually explicit content have innocuous domain names and therefore can be reached accidentally. A commonly cited example is http://www.whitehouse.com. Other innocent-sounding URLs that retrieve graphic, sexually explicit depictions include http://www.boys.com, http://www.girls.com, http://www.coffeebeansupply.com, and http://www.BookstoreUSA.com. Moreover, commercial Web sites that contain sexually explicit material often use a technique of attaching pop-up windows to their sites, which open new windows advertising other sexually explicit sites without any prompting by the user. This technique makes it difficult for a user quickly to exit all of the pages containing sexually explicit material, whether he or she initially accessed such material intentionally or not.

The percentage of Web pages on the indexed Web containing sexually explicit content is relatively small. Recent estimates indicate that no more than 1–2% of the content on the Web is pornographic or sexually explicit. However, the absolute number of Web sites offering free sexually explicit material is extremely large, approximately 100,000 sites. 4. American Public Libraries The more than 9,000 public libraries in the United States are typically funded (at least in large part) by state or local governments. They are frequently overseen by a board of directors that is either elected or is appointed by an elected official or a body of elected officials. We heard testimony from librarians and library board members working in eight public library systems in different communities across the country, some of whom are also plaintiffs in this case. They hailed from the following library systems: Fort Vancouver, Washington; Fulton County, Indiana; Greenville, South Carolina; a regional consortium of libraries centered in Madison, Wisconsin; Multnomah County, Oregon; Norfolk, Virginia; Tacoma, Washington; and Westerville, Ohio. The parties also took depositions from several other librarians and library board members who did not testify during the trial, and submitted a number of other documents regarding individual libraries' policies. 1. The Mission of Public Libraries, and Their Reference and Collection Development Practices

American public libraries operate in a wide variety of communities, and it is not surprising that they do not all view their mission identically. Nor are their practices uniform. Nevertheless, they generally share a common mission to provide patrons with a wide range of information and ideas. Public libraries across the country have endorsed the American Library Association's ("ALA") "Library Bill of Rights" and/or "Freedom to Read Statement," including every library testifying on behalf of the defendants in this case. The "Library Bill of Rights," first adopted by the ALA in 1948, provides, among other things, that "[b]ooks and other library resources should be provided for the interest, information, and enlightenment of all people of the community the library serves." It also states that libraries "should provide materials and information presenting all points of view on current and historical issues" and that library materials "should not be proscribed or removed because of partisan or doctrinal disapproval." The ALA's "Freedom to Read" statement, adopted in 1953 and most recently updated in July 2000, states, among other things, that "[i]t is in the public interest for publishers and librarians to make available the widest diversity of views and expressions, including those that are unorthodox or unpopular with the majority." It also states that "[i]t is the responsibility of … librarians … to contest encroachments upon th[e] freedom [to read] by individuals or groups seeking to impose their own standards or tastes upon the community at large."

Public libraries provide information not only for educational purposes, but also for recreational, professional, and other purposes. For example, Ginnie Cooper, Director of the Multnomah County Library, testified that some of the library's most popular items include video tapes of the British Broadcasting Corporation's "Fawlty Towers" series, and also print and "books on tape" versions of science fiction, romance, and mystery novels. Many public libraries include sexually explicit materials in their print collection, such as The Joy of Sex and The Joy of Gay Sex. Very few public libraries, however, collect more graphic sexually explicit materials, such as XXX-rated videos, or Hustler magazine. The mission of public librarians is to provide their patrons with a wide array of information, and they surely do so. Reference librarians across America answer more than 7 million questions weekly. If a patron has a specialized need for information not available in the public library, the professional librarian will use a reference interview to find out what information is needed to help the user, including the purpose for which an item will be used. Reference librarians are trained to assist patrons without judging the patron's purpose in seeking information, or the content of the information that the patron is seeking.

Many public libraries routinely provide patrons with access to materials not in their collections through the use of bibliographic access tools and interlibrary loan programs. Public libraries typically will assist patrons in obtaining access to all materials except those that are illegal, even if they do not collect those materials in their physical collection. In order to provide this access, a librarian may attempt to find material not included in the library's own collection in other libraries in the system, through interlibrary loan, or through a referral, perhaps to a government agency or a commercial bookstore. Interlibrary loan is expensive, however, and is therefore used infrequently. Public librarians also apply professional standards to their collection development practices. Public libraries generally make material selection decisions and frame policies governing collection development at the local level. Collection development is a key subject in the curricula of Masters of Library Science programs and is defined by certain practices. In general, professional standards guide public librarians to build, develop and create collections that have certain characteristics, such as balance in its coverage and requisite and appropriate quality. To this end, the goal of library collections is not universal coverage, but rather to find those materials that would be of the greatest direct benefit or interest to the community. In making selection decisions, librarians consider criteria including the content of the material, its accuracy, the title's niche in relation to the rest of the collection, the authority of the author, the publisher, the work's presentation, and how it compares with other material available in the same genre or on the same subject.

In pursuing the goal of achieving a balanced collection that serves the needs and interests of their patrons, librarians generally have a fair amount of autonomy, but may also be guided by a library's collection development policy. These collection development policies are often drawn up in conjunction with the libraries' governing boards and with representatives from the community, and may be the result of public hearings, discussions and other input. Although many librarians use selection aids, such as review journals and bibliographies, as a guide to the quality of potential acquisitions, they do not generally delegate their selection decisions to parties outside of the public library or its governing body. One limited exception is the use of third- party vendors or approval plans to acquire print and video resources. In such arrangements, third-party vendors provide materials based on the library's description of its collection development criteria. The vendor sends materials to the library, and the library retains the materials that meet its collection development needs and returns the materials that do not. Even in this arrangement, however, the librarians still retain ultimate control over their collection development and review all of the materials that enter their library's collection. 2. The Internet in Public Libraries

The vast majority of public libraries offer Internet access to their patrons. According to a recent report by the U.S. National Commission on Libraries and Information Science, approximately 95% of all public libraries provide public access to the Internet. John C. Bertot & Charles R. McClure, Public Libraries and the Internet 2000: Summary Findings and Data Tables, Report to National Commission on Libraries and Information Science, at 3. The Internet vastly expands the amount of information available to patrons of public libraries. The widespread availability of Internet access in public libraries is due, in part, to the availability of public funding, including state and local funding and the federal funding programs regulated by CIPA. Many libraries face a large amount of patron demand for their Internet services. At some libraries, patron demand for Internet access during a given day exceeds the supply of computer terminals with access to the Internet. These libraries use sign- in and time limit procedures and/or establish rules regarding the allowable uses of the terminals, in an effort to ration their computer resources. For example, some of the libraries whose librarians testified at trial prohibit the use of email and chat functions on their public Internet terminals. Public libraries play an important role in providing Internet access to citizens who would not otherwise possess it. Of the 143 million Americans using the Internet, approximately 10%, or 14.3 million people, access the Internet at a public library. Internet access at public libraries is more often used by those with lower incomes than those with higher incomes. About 20.3% of Internet users with household family income of less than $15,000 per year use public libraries for Internet access. Approximately 70% of libraries serving communities with poverty levels in excess of 40% receive E-rate discounts. 1. Internet Use Policies in Public Libraries

Approximately 95% of libraries with public Internet access have some form of "acceptable use" policy or "Internet use" policy governing patrons' use of the Internet. These policies set forth the conditions under which patrons are permitted to access and use the library's Internet resources. These policies vary widely. Some of the less restrictive policies, like those held by Multnomah County Library and Fort Vancouver Regional Library, do not prohibit adult patrons from viewing sexually explicit materials on the Web, as long as they do so at terminals with privacy screens or recessed monitors, which are designed to prevent other patrons from seeing the material that they are viewing, and as long as it does not violate state or federal law to do so. Other libraries prohibit their patrons from viewing all "sexually explicit" or "sexually graphic" materials. Some libraries prohibit the viewing of materials that are not necessarily sexual, such as Web pages that are "harmful to minors," "offensive to the public," "objectionable," "racially offensive," or simply "inappropriate." Other libraries restrict access to Web sites that the library just does not want to provide, even though the sites are not necessarily offensive. For example, the Fulton County Public Library restricts access to the Web sites of dating services. Similarly, the Tacoma Public Library's policy does not allow patrons to use the library's Internet terminals for personal email, for online chat, or for playing games. In some cases, libraries instituted Internet use policies after having experienced specific problems, whereas in other cases, libraries developed detailed Internet use policies and regulatory measures (such as using filtering software) before ever offering public Internet access. Essentially four interests motivate libraries to institute Internet use policies and to apply the methods described above to regulate their patrons' use of the Internet.

First, libraries have sought to protect patrons (especially children) and staff members from accidentally viewing sexually explicit images, or other Web pages containing content deemed harmful, that other patrons are viewing on the Internet. For example, some librarians who testified described situations in which patrons left sexually explicit images minimized on an Internet terminal so that the next patron would see them when they began using it, or in which patrons printed sexually explicit images from a Web site and left them at a public printer. Second, libraries have attempted to protect patrons from unwittingly or accidentally accessing Web pages that they do not wish to see while they are using the Internet. For example, the Memphis-Shelby County (Tennessee) Public Library's Internet use policy states that the library "employs filtering technology to reduce the possibility that customers may encounter objectionable content in the form of depictions of full nudity and sexual acts."

Third, libraries have sought to keep patrons (again, especially children) from intentionally accessing sexually explicit materials or other materials that the library deems inappropriate. For example, a study of the Tacoma Public Library's Internet use logs for the year 2000 showed that users between the ages of 11 and 15 accounted for 41% of the filter blocks that occurred on library computers. The study, which we credit, concluded that children and young teens were actively seeking to access sexually explicit images in the library. The Greenville Library's Board of Directors was particularly concerned that patrons were accessing obscene materials in the public library in violation of South Carolina's obscenity statute. Finally, some libraries have regulated patrons' Internet use to attempt to control patrons' inappropriate (or illegal) behavior that is thought to stem from viewing Web pages that contain sexually explicit materials or content that is otherwise deemed unacceptable. We recognize the concerns that led several of the public libraries whose librarians and board members testified in this case to start using Internet filtering software. The testimony of the Chairman of the Board of the Greenville Public Library is illustrative. In December 1999, there was considerable local press coverage in Greenville concerning adult patrons who routinely used the library to surf the Web for pornography. In response to public outcry stemming from the newspaper report, the Board of Trustees held a special board meeting to obtain information and to communicate with the public concerning the library's provision of Internet access. At this meeting, the Board learned for the first time of complaints about children being exposed to pornography that was displayed on the library's Internet terminals.

In late January to early February of 2000, the library installed privacy screens and recessed terminals in an effort to restrict the display of sexually explicit Web sites at the library. In February, 2000, the Board informed the library staff that they were expected to be familiar with the South Carolina obscenity statute and to enforce the policy prohibition on access to obscene materials, child pornography, or other materials prohibited under applicable local, state, and federal laws. Staff were told that they were to enforce the policy by means of a "tap on the shoulder." Prior to adopting its current Internet Use Policy, the Board adopted an "Addendum to Current Internet Use Policy." Under the policy, the Board temporarily instituted a two-hour time limit per day for Internet use; reduced substantially the number of computers with Internet access in the library; reconfigured the location of the computers so that librarians had visual contact with all Internet-accessible terminals; and removed the privacy screens from terminals with Internet access. Even after the Board implemented the privacy screens and later the "tap-on-the-shoulder" policy combined with placing terminals in view of librarians, the library experienced a high turnover rate among reference librarians who worked in view of Internet terminals. Finding that the policies that it had tried did not prevent the viewing of sexually explicit materials in the library, the Board at one point considered discontinuing Internet access in the library. The Board finally concluded that the methods that it had used to regulate Internet use were not sufficient to stem the behavioral problems that it thought were linked to the availability of pornographic materials in the library. As a result, it implemented a mandatory filtering policy.

We note, however, that none of the libraries proffered by the defendants presented any systematic records or quantitative comparison of the amount of criminal or otherwise inappropriate behavior that occurred in their libraries before they began using Internet filtering software compared to the amount that happened after they installed the software. The plaintiffs' witnesses also testified that because public libraries are public places, incidents involving inappropriate behavior in libraries (sexual and otherwise) existed long before libraries provided access to the Internet. 2. Methods for Regulating Internet Use The methods that public libraries use to regulate Internet use vary greatly. They can be organized into four categories: (1) channeling patrons' Internet use; (2) separating patrons so that they will not see what other patrons are viewing; (3) placing Internet terminals in public view and having librarians observe patrons to make sure that they are complying with the library's Internet use policy; and (4) using Internet filtering software. The first category channeling patrons' Internet use frequently includes offering training to patrons on how to use the Internet, including how to access the information that they want and to avoid the materials that they do not want. Another technique that some public libraries use to direct their patrons to pages that the libraries have determined to be accurate and valuable is to establish links to "recommended Web sites" from the public library's home page (i.e., the page that appears when patrons begin a session at one of the library's public Internet terminals). Librarians select these recommended Web sites by using criteria similar to those employed in traditional collection development. However, unless the library determines otherwise, selection of these specific sites does not preclude patrons from attempting to access other Internet Web sites.

Libraries may extend the "recommended Web sites" method further by limiting patrons' access to only those Web sites that are reviewed and selected by the library's staff. For example, in 1996, the Westerville, Ohio Library offered Internet access to children through a service called the "Library Channel." This service was intended to be a means by which the library could organize the Internet in some fashion for presentation to patrons. Through the Library Channel, the computers in the children's section of the library were restricted to 2,000 to 3,000 sites selected by librarians. After three years, Westerville stopped using the Library Channel system because it overly constrained the children's ability to access materials on the Internet, and because the library experienced several technical problems with the system.

Public libraries also use several different techniques to separate patrons during Internet sessions so that they will not see what other patrons are viewing. The simplest way to achieve this result is to position the library's public Internet terminals so that they are located away from traffic patterns in the library (and from other terminals), for example, by placing them so that they face a wall. This method is obviously constrained by libraries' space limitations and physical layout. Some libraries have also installed privacy screens on their public Internet terminals. These screens make a monitor appear blank unless the viewer is looking at it head-on. Although the Multnomah and Fort Vancouver Libraries submitted records showing that they have received few complaints regarding patrons' unwilling exposure to materials on the Internet, privacy screens do not always prevent library patrons or employees from inadvertently seeing the materials that another patron is viewing when passing directly behind a terminal. They also have the drawback of making it difficult for patrons to work together at a single terminal, or for librarians to assist patrons at terminals, because it is difficult for two people to stand side by side and view a screen at the same time. Some library patrons also find privacy screens to be a hindrance and have attempted to remove them in order to improve the brightness of the screen or to make the view better.

Another method that libraries use to prevent patrons from seeing what other patrons are viewing on their terminals is the installation of "recessed monitors." Recessed monitors are computer screens that sit below the level of a desk top and are viewed from above. Although recessed monitors, especially when combined with privacy screens, eliminate almost all of the possibility of a patron accidentally viewing the contents on another patron's screen, they suffer from the same drawbacks as privacy screens, that is, they make it difficult for patrons to work together or with a librarian at a single terminal. Some librarians also testified that recessed monitors are costly, but did not indicate how expensive they are compared to privacy screens or filtering software. A related technique that some public libraries use is to create a separate children's Internet viewing area, where no adults except those accompanying children in their care may use the Internet terminals. This serves the objective of keeping children from inadvertently viewing materials appropriate only for adults that adults may be viewing on nearby terminals. A third set of techniques that public libraries have used to enforce their Internet use policies takes the opposite tack from the privacy screens/recessed monitors approach by placing all of the library's public Internet terminals in prominent and visible locations, such as near the library's reference desk. This approach allows librarians to enforce their library's Internet use policy by observing what patrons are viewing and employing the tap-on-the-shoulder policy. Under this approach, when patrons are viewing materials that are inconsistent with the library's policies, a library staff member approaches them and asks them to view something else, or may ask them to end their Internet session. A patron who does not comply with these requests, or who repeatedly views materials not permitted under the library's Internet use policy, may have his or her Internet or library privileges suspended or revoked. But many librarians are uncomfortable with approaching patrons who are viewing sexually explicit images, finding confrontation unpleasant. Hence some libraries are reluctant to apply the tap-on-the- shoulder policy.