Copyright for xtrlock source package in Huanghe V3.0

Format: https://www.debian.org/doc/packaging-manuals/copyright-format/1.0/
Upstream-Contact: Ian Jackson 
Upstream-Name: xtrlock

Files: *
Copyright:
 © 1993, 1994 Ian Jackson 
 © 1996 Marek Michalkiewicz 
License: GPL-3+

Files: debian/*
Copyright:
 © 1995 Stephen Early 
 © 1997 — 2002 Martin Mitchell 
 © 2002 Otavio Salvador 
 © 2005 — 2016 Matthew Vernon 
 © 2019 Chris Lamb 
License: GPL-3+

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 2 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.
 .
 You should have received a copy of the GNU General Public License
 along with this program.  If not, see .
 .
 On Debian systems, the complete text of the GNU General Public License
 can be found in the /usr/share/common-licenses/GPL-3 file.