Copyright for golang-github-xi2-xz source package in Oracular

Format: https://www.debian.org/doc/packaging-manuals/copyright-format/1.0/
Upstream-Name: xz
Source: https://github.com/xi2/xz

Files: *
Copyright: not applicable
License: public-domain

Files: debian/*
Copyright: 2015 Dmitry Smirnov 
License: GPL-3+

Files: debian/patches/*
Copyright: 2015 Dmitry Smirnov 
License: GPL-3+ or public-domain
Comment: patches can be licensed under the same terms as upstream.

License: public-domain
 All the files in this package have been written by Michael Cross,
 Lasse Collin and/or Igor PavLov. All these files have been put
 into the public domain. You can do whatever you want with these
 files.
 .
 This software is provided "as is", without any warranty.

License: GPL-3+
 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, either version 3 of the License, or
 (at your option) any later version.
 ․
 This program 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.
 ․
 The complete text of the GNU General Public License version 3
 can be found in "/usr/share/common-licenses/GPL-3".