This paper discusses the legal obligations owed by librarians to the users of their facilities, focusing on the viewing of pornography on the Internet in the public library. The meanings commonly ascribed to the word censorship are presented. Australian federal law that governs the classification of films, videos, computer games, and publications and sets up the requirements related to their access and display is summarized. The guidelines for classification are presented, including the criteria for Refused Classification items, i.e., items that cannot legally be made available. Libraries' obligations under the Online Services Act are addressed, as well as child protection ramifications of Internet pornography in public libraries. Finally, the adequacy of existing policies in libraries is considered, and it is concluded that there are effective ways in which libraries can be both provider and protector. (Contains 26 references.) (MES)