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/usr/share/doc/gprolog-doc/copyright is in gprolog-doc 1.3.0-6.1.

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

The actual contents of the file can be viewed below.

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This Package is now in Debian form in the main CVS repository.

This package was initially debianized by Milan Zamazal <pdm@debian.org>.  It
is presently being maintained by Salvador Abreu <spa@debian.org>.

It was made from a snapshot of the GNU Prolog CVS archive on sourceforge.net,
taken slightly before the package itself was made.

Copyright:

  Copyright (C) 1999-2004 Daniel Diaz

  GNU Prolog is free software; you can redistribute it and/or modify it
  under the terms of the GNU General Public License as published by the
  Free Software Foundation; either version 2, or any later version.

  GNU Prolog is distributed in the hope that it will be useful, but
  WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  General Public License for more details.

On Debian systems, you can find the GNU General Public License in the file
/usr/share/common-licenses/GPL.