Copyright for doc-base source package in Nile V2.0

Format: https://www.debian.org/doc/packaging-manuals/copyright-format/1.0/

Files: *
Copyright: 2006-2016, Robert Luberda 
           1998-2003, Adam Di Carlo 
           1998,      Adam P. Harris 
           1997-1998, Christian Schwarz 
License: GPL-2+

Files: doc/xsl/*.xsl
Copyright: 1996 - 1998, Ian Jackson and Christian Schwarz
           1999, Chris Waters, Joey Hess, and Joost Witteveen
           1999, 2001, Raphaël Hertzog and Brendan O'Dea
           1999-2017, many other Debian contributors
License: GPL-2+
Comment: Files copied from version 4.1.3 of debian-policy package.

License: GPL-2+
 This program 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; version 2 dated June, 1991, or (at
 your option) any later version.
 .
 On Debian systems, the complete text of version 2 of the GNU General
 Public License can be found in '/usr/share/common-licenses/GPL-2'.