17 U.S.C. § 402 : US Code - Section 402: Notice of copyright: Phonorecords of sound recordings

      (a) General Provisions. - Whenever a sound recording protected
    under this title is published in the United States or elsewhere by
    authority of the copyright owner, a notice of copyright as provided
    by this section may be placed on publicly distributed phonorecords
    of the sound recording.
      (b) Form of Notice. - If a notice appears on the phonorecords, it
    shall consist of the following three elements:
        (1) the symbol P (the letter P in a circle); and
        (2) the year of first publication of the sound recording; and
        (3) the name of the owner of copyright in the sound recording,
      or an abbreviation by which the name can be recognized, or a
      generally known alternative designation of the owner; if the
      producer of the sound recording is named on the phonorecord
      labels or containers, and if no other name appears in conjunction
      with the notice, the producer's name shall be considered a part
      of the notice.

      (c) Position of Notice. - The notice shall be placed on the
    surface of the phonorecord, or on the phonorecord label or
    container, in such manner and location as to give reasonable notice
    of the claim of copyright.
      (d) Evidentiary Weight of Notice. - If a notice of copyright in
    the form and position specified by this section appears on the
    published phonorecord or phonorecords to which a defendant in a
    copyright infringement suit had access, then no weight shall be
    given to such a defendant's interposition of a defense based on
    innocent infringement in mitigation of actual or statutory damages,
    except as provided in the last sentence of section 504(c)(2).