law: Copyright Act, 1957 
  23. Term of copyright in anonymous and
  
  pseudonymous works – 
  (I) in the case of a literary, dramatic,
  
  musical or artistic work (other than photograph), which is published
  
  anonymously, copyright shall subsist until [(Note: Subs. by Act No.13 of
  
  1992, S.2, w.e.f. 28-12-1991. In this regard S.3 of Act No.13 of 1992 reads:
  
  "3. Copyright not to subsist if term has expired - For the removal of
  
  doubts, it is hereby declared that copyright shall not subsist by virtue of
  
  this Act in any work in which copyright did not subsist immediately before the
  
  commencement of this Act.") sixty years] from the beginning of the
  
  calendar year next following the years in which the work is fist published.
  Provided  that where the identity of the author
  
  is disclosed before the expiry of the said period, copyright shall subsist
  
  until [(Note: Subs. by Act No.13 of 1992, S.2, w.e.f. 28-12-1991. In this
  
  regard S.3 of Act No.13 of 1992 reads: "3. Copyright not to subsist if
  
  term has expired - For the removal of doubts, it is hereby declared that
  
  copyright shall not subsist by virtue of this Act in any work in which
  
  copyright did not subsist immediately before the commencement of this
  
  Act.") sixty years] from the beginning of the calendar year next
  
  following the year in which the author dies.
  (2) In sub section (1), references to the
  
  author shall, in the case of an anonymous work of joint authorship, be
  
  construed.- 
  a. where the identity
  
  of one of the author is disclosed, as references to that author,
  b. where the identity
  
  of more author than one is disclosed, as reference to the author who dies last
  
  from amongst such authors.
  (3) In such section (1), references to the
  
  author shall, in the case of a pseudonymous work of joint authorship, be
  
  construed,- 
  a. where the names of
  
  one or more (but not all) of the authors are pseudonymous and his or their
  
  identity is not disclosed, as references to the author whose name is not a
  
  pseudonym, or, if the names of two or more the authors are not pseudonymous, as
  
  references to such of those authors who dies last,
  b. where the
  
  names of one or more ( but not all) of the authors are pseudonyms and the
  
  identity of one or more of them is disclosed, as references to the author who
  
  dies last from amongst the authors whose names are not pseudonymous and the
  
  authors whose names are pseudonyms and disclosed, and
  c. where the
  
  names of all the authors are pseudonyms and the identity of one of them is
  
  disclosed, as references to the authors whose identity is disclosed or if the
  
  identity of two or more of such authors is disclosed, as references to such of
  
  those authors who dies last.
  Explanation- For the purposes of
  
  this section, the identity of an author shall be deemed to have been disclosed,
  
  if either the identity of the author is disclosed publicly by both the author
  
  and the publisher or is otherwise established to the satisfaction of the
  
  Copyright Board by that author.