Copyright for bison-doc source package in Xenial

Format: http://www.debian.org/doc/packaging-manuals/copyright-format/1.0/
Upstream-Name: Bison
Upstream-Contact: bug-bison@gnu.org
Source: http://ftp.gnu.org/pub/gnu/bison/
Disclaimer:
 This package is not part of Debian GNU/Linux because it contains
 documentation under GFDL with Front-Cover and Back-Cover Texts.
Comment: 
 This file is extracted from upstream source with debian/repack.

Files: *
Copyright: 1984, 1986, 1987-2015 Free Software Foundation, Inc.
License: GPL-3+
 On Debian systems, the full text of the GNU General Public License
 Version 3 can be found in the file
 '/usr/share/common-licenses/GPL-3'.

Files: doc/bison.texi doc/bison.info
Copyright: 1988-1993, 1995, 1998-2015 Free Software Foundation, Inc.
License: GFDL-1.3+
 Permission is granted to copy, distribute and/or modify this document
 under the terms of the GNU Free Documentation License, Version 1.3 or
 any later version published by the Free Software Foundation; with no
 Invariant Sections, with the Front-Cover texts being “A GNU Manual,”
 and with the Back-Cover Texts as in (a) below.  A copy of the license
 is included in the section entitled “GNU Free Documentation License.”
 .
 (a) The FSF’s Back-Cover Text is: “You have the freedom to copy and
 modify this GNU manual.  Buying copies from the FSF supports it in
 developing GNU and promoting software freedom.”
 .
 On Debian systems, the full text of the GNU Free Documentation
 License Version 1.3 can be found in the file
 '/usr/share/common-licenses/GFDL-1.3'.

Files: debian/*
Copyright: 2015 Chuan-kai Lin 
License: GPL-2+
 On Debian systems, the full text of the GNU General Public License
 Version 2 can be found in the file
 '/usr/share/common-licenses/GPL-2'.