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/usr/share/doc/proj-bin/copyright is in proj-bin 4.7.0-1.

This file is owned by root:root, with mode 0o644.

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This package was debianized by Peter S Galbraith psg@debian.org on
Sun, 24 Oct 1999 14:13:26 -0400. It is currently maintained by 
the DebianGis team.

The Debian orig.tar.gz files combines:

  ftp://ftp.remotesensing.org/proj/proj-4.4.9.tar.gz
  ftp://ftp.remotesensing.org/proj/proj-datumgrid-1.3.zip

where the second is unzipped in the nad directory before configuring to add
NAD27/NAD83 and NZGD49 datum conversion.

Web page:       http://www.remotesensing.org/proj
Old Web pages:  http://kai.er.usgs.gov/ftp/mapgenproj.html
                http://www.vectaport.com/ivmaps/projinfo.html

Version 4.3.3 was authored by:
   Gerald (Jerry) Ian Evenden
   email: gie@kai.er.usgs.gov   gevenden@capecod.net
   phone: (508)563-6766
   P.O. Box 1027
   N.Falmouth, MA 02556-1027

 Proj is a U.S. Government work and is not eligible for U.S. copyright
 protection.  This is free software.

 Here's what Jerry replied when I asked what the license was:

  `The software was developed by the USGS and has no copyright
   nor license.  Do with it what you will.  :-)'

Maintenance of proj has been taken up by Frank Warmerdam <warmerda@home.com>
under the following license:

  All source, data files and other contents of the PROJ.4 package are 
  available under the following terms.  Note that the PROJ 4.3 and earlier
  was "public domain" as is common with US government work, but apparently
  this is not a well defined legal term in many countries.  I am placing 
  everything under the following MIT style license because I believe it is
  effectively the same as public domain, allowing anyone to use the code as
  they wish, including making proprietary derivatives. 
  
  Though I have put my own name as copyright holder, I don't mean to imply
  I did the work.  Essentially all work was done by Gerald Evenden. 
  
   --------------
  
   Copyright (c) 2000, Frank Warmerdam
  
   Permission is hereby granted, free of charge, to any person obtaining a
   copy of this software and associated documentation files (the "Software"),
   to deal in the Software without restriction, including without limitation
   the rights to use, copy, modify, merge, publish, distribute, sublicense,
   and/or sell copies of the Software, and to permit persons to whom the
   Software is furnished to do so, subject to the following conditions:
  
   The above copyright notice and this permission notice shall be included
   in all copies or substantial portions of the Software.
  
   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
   OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
   FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
   THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
   LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
   FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
   DEALINGS IN THE SOFTWARE.