law: Copyright Act, 1957 
  21. Right of author to relinquish copyright- 
  (1) The author of a work may relinquish all or
  
  any of the rights comprised in the copyright in the work by giving notice in
  
  the prescribed form to the Registrar of Copyrights and thereupon such rights
  
  shall, subject to the provision of sub section (3), cease to exist from the
  
  date of the notice.
  (2) On receipt of a notice under sub section
  
  (1), the Registrar of Copyrights shall cause it to be published in the Official
  
  Gazette and in such other manner, as he may deem fit.
  (3) The relinquishment of all or any of the
  
  rights comprised in the copyright in a work shall not affect any rights
  
  subsisting in favor of any person on the date of the notice referred to in sub
  
  section. (1).