Selected Sections from the Digital Millennium Copyright Act of 1998.
 

DMCA §512(c)(1):
 

     [a] service provider shall not be liable . . . for infringement of copyright by reason of
     the storage at the direction of a user of material that resides on a system or network
     controlled or operated by or for the service provider, if the service provider

          (A)

               (i) does not have actual knowledge that the material or an activity using
               the material on the system or network is infringing;

               (ii) in the absence of such actual knowledge, is not aware of facts or
               circumstances from which infringing activity is apparent; or

               (iii) upon obtaining such knowledge or awareness, acts expeditiously to
               remove, or disable access to, the material;

          (B) does not receive a financial benefit directly attributable to the infringing
          activity, in a case in which the service provider has the right and ability to
          control such activity; and

          (C) upon notification of claimed infringement as described in paragraph (3),
          responds expeditiously to remove, or disable access to, the material that is
          claimed to be infringing or to be the subject of infringing activity.


[A link to a pdf version of the full text of the DMCA can be found here - optional]
 

DMCA §1201: Circumvention of copyright protection systems

     (a) Violations Regarding Circumvention of Technological Measures. -

(1)

          (A) No person shall circumvent a technological measure that effectively controls
           access to a work protected under this title. The prohibition contained in the
           preceding sentence shall take effect at the end of the 2-year period beginning on
           the date of the enactment of this chapter.

          (B) The prohibition contained in subparagraph (A) shall not apply to persons who
          are users of a copyrighted work which is in a particular class of works, if such
          persons are, or are likely to be in the succeeding 3-year period, adversely affected
          by virtue of such prohibition in their ability to make noninfringing uses of that
          particular class of works under this title, as determined under subparagraph (C).

          (C) During the 2-year period described in subparagraph (A), and during each
          succeeding 3-year period, the Librarian of Congress, upon the recommendation of
          the Register of Copyrights, who shall consult with the Assistant Secretary for
          Communications and Information of the Department of Commerce and report and
          comment on his or her views in making such recommendation, shall make the
          determination in a rulemaking proceeding on the record for purposes of
          subparagraph (B) of whether persons who are users of a copyrighted work are, or
          are likely to be in the succeeding 3-year period, adversely affected by the
          prohibition under subparagraph (A) in their ability to make noninfringing uses under
          this title of a particular class of copyrighted works. In conducting such rulemaking,
          the Librarian shall examine -

               (i) the availability for use of copyrighted works;

               (ii) the availability for use of works for nonprofit archival,
               preservation, and educational purposes;

               (iii) the impact that the prohibition on the circumvention of
               technological measures applied to copyrighted works has on
               criticism, comment, news reporting, teaching, scholarship, or
               research;

               (iv) the effect of circumvention of technological measures on
               the market for or value of copyrighted works; and

               (v) such other factors as the Librarian considers appropriate.

          (D) The Librarian shall publish any class of copyrighted works for which the
          Librarian has determined, pursuant to the rulemaking conducted under
          subparagraph (C), that noninfringing uses by persons who are users of a
          copyrighted work are, or are likely to be, adversely affected, and the prohibition
          contained in subparagraph (A) shall not apply to such users with respect to such
          class of works for the ensuing 3-year period.

          (E) Neither the exception under subparagraph (B) from the applicability of the
          prohibition contained in subparagraph (A), nor any determination made in a
          rulemaking conducted under subparagraph (C), may be used as a defense in any
          action to enforce any provision of this title other than this paragraph.

               (2) No person shall manufacture, import, offer to the public, provide, or
               otherwise traffic in any technology, product, service, device, component, or
               part thereof, that -

          (A) is primarily designed or produced for the purpose of
          circumventing a technological measure that effectively controls
          access to a work protected under this title;

          (B) has only limited commercially significant purpose or use
          other than to circumvent a technological measure that effectively
          controls access to a work protected under this title; or

          (C) is marketed by that person or another acting in concert
          with that person with that person's knowledge for use in
          circumventing a technological measure that effectively controls
          access to a work protected under this title.

               (3) As used in this subsection -

          (A) to ''circumvent a technological measure'' means to
          descramble a scrambled work, to decrypt an encrypted work, or
          otherwise to avoid, bypass, remove, deactivate, or impair a
          technological measure, without the authority of the copyright
          owner; and

          (B) a technological measure ''effectively controls access to a
          work'' if the measure, in the ordinary course of its operation,
          requires the application of information, or a process or a
          treatment, with the authority of the copyright owner, to gain
          access to the work.
 

[A link to a pdf version of the full text of the DMCA can be found here - optional]