47 U.S.C. § 230 : US Code - Section 230: Protection for private blocking and screening of offensive material

    (a) Findings
      The Congress finds the following:
        (1) The rapidly developing array of Internet and other
      interactive computer services available to individual Americans
      represent an extraordinary advance in the availability of
      educational and informational resources to our citizens.
        (2) These services offer users a great degree of control over
      the information that they receive, as well as the potential for
      even greater control in the future as technology develops.
        (3) The Internet and other interactive computer services offer
      a forum for a true diversity of political discourse, unique
      opportunities for cultural development, and myriad avenues for
      intellectual activity.
        (4) The Internet and other interactive computer services have
      flourished, to the benefit of all Americans, with a minimum of
      government regulation.
        (5) Increasingly Americans are relying on interactive media for
      a variety of political, educational, cultural, and entertainment
      services.
    (b) Policy
      It is the policy of the United States - 
        (1) to promote the continued development of the Internet and
      other interactive computer services and other interactive media;
        (2) to preserve the vibrant and competitive free market that
      presently exists for the Internet and other interactive computer
      services, unfettered by Federal or State regulation;
        (3) to encourage the development of technologies which maximize
      user control over what information is received by individuals,
      families, and schools who use the Internet and other interactive
      computer services;
        (4) to remove disincentives for the development and utilization
      of blocking and filtering technologies that empower parents to
      restrict their children's access to objectionable or
      inappropriate online material; and
        (5) to ensure vigorous enforcement of Federal criminal laws to
      deter and punish trafficking in obscenity, stalking, and
      harassment by means of computer.
    (c) Protection for "Good Samaritan" blocking and screening of
      offensive material
      (1) Treatment of publisher or speaker
        No provider or user of an interactive computer service shall be
      treated as the publisher or speaker of any information provided
      by another information content provider.
      (2) Civil liability
        No provider or user of an interactive computer service shall be
      held liable on account of - 
          (A) any action voluntarily taken in good faith to restrict
        access to or availability of material that the provider or user
        considers to be obscene, lewd, lascivious, filthy, excessively
        violent, harassing, or otherwise objectionable, whether or not
        such material is constitutionally protected; or
          (B) any action taken to enable or make available to
        information content providers or others the technical means to
        restrict access to material described in paragraph (1).(!1)

    (d) Obligations of interactive computer service
      A provider of interactive computer service shall, at the time of
    entering an agreement with a customer for the provision of
    interactive computer service and in a manner deemed appropriate by
    the provider, notify such customer that parental control
    protections (such as computer hardware, software, or filtering
    services) are commercially available that may assist the customer
    in limiting access to material that is harmful to minors. Such
    notice shall identify, or provide the customer with access to
    information identifying, current providers of such protections.
    (e) Effect on other laws
      (1) No effect on criminal law
        Nothing in this section shall be construed to impair the
      enforcement of section 223 or 231 of this title, chapter 71
      (relating to obscenity) or 110 (relating to sexual exploitation
      of children) of title 18, or any other Federal criminal statute.
      (2) No effect on intellectual property law
        Nothing in this section shall be construed to limit or expand
      any law pertaining to intellectual property.
      (3) State law
        Nothing in this section shall be construed to prevent any State
      from enforcing any State law that is consistent with this
      section. No cause of action may be brought and no liability may
      be imposed under any State or local law that is inconsistent with
      this section.
      (4) No effect on communications privacy law
        Nothing in this section shall be construed to limit the
      application of the Electronic Communications Privacy Act of 1986
      or any of the amendments made by such Act, or any similar State
      law.
    (f) Definitions
      As used in this section:
      (1) Internet
        The term "Internet" means the international computer network of
      both Federal and non-Federal interoperable packet switched data
      networks.
      (2) Interactive computer service
        The term "interactive computer service" means any information
      service, system, or access software provider that provides or
      enables computer access by multiple users to a computer server,
      including specifically a service or system that provides access
      to the Internet and such systems operated or services offered by
      libraries or educational institutions.
      (3) Information content provider
        The term "information content provider" means any person or
      entity that is responsible, in whole or in part, for the creation
      or development of information provided through the Internet or
      any other interactive computer service.
      (4) Access software provider
        The term "access software provider" means a provider of
      software (including client or server software), or enabling tools
      that do any one or more of the following:
          (A) filter, screen, allow, or disallow content;
          (B) pick, choose, analyze, or digest content; or
          (C) transmit, receive, display, forward, cache, search,
        subset, organize, reorganize, or translate content.