This New Zealand work is in the public domain in New Zealand, because its copyright has expired or it is not subject to copyright. According to the New Zealand Copyright Act of 1994 as elaborated on by the the Standing Committee on Copyright of the Library and Information Association of New Zealand (LIANZA), as of May 2011:
Type of material
Copyright has expired if ...
For photographs, manuscripts, archives, music scores, maps, paintings, and drawings published anonymously, under a pseudonym or the creator is unknown:
photo taken or work published prior to 1 January 1966
For photographs, manuscripts, archives, music scores, maps, paintings, and drawings (except A-C)
Creator died before 1 January 1966
For oral histories, music, computer-generated work and spoken word sound recordings
Released before 1 January 1966
1 Some government publications are not subject to copyright, including bills, acts, regulations, court judgments, royal commission and select committee reports, etc. See references  or  for the full list.