Copyright for debian-reference source package in Bullseye

Format: https://www.debian.org/doc/packaging-manuals/copyright-format/1.0/
Upstream-Name: debian-reference
Upstream-Contact: Osamu Aoki 
Source: https://salsa.debian.org/debian/debian-reference.git

Files: *
Copyright: 2007-2013 Osamu Aoki 
License: GPL-2+
 This document may used under the terms the GNU General Public License
 version 2 or higher.
 .
 Permission is granted to make and distribute verbatim copies of
 this document provided the copyright notice and this permission notice
 are preserved on all copies.
 .
 Permission is granted to copy and distribute modified versions of
 this document under the conditions for verbatim copying, provided that
 the entire resulting derived work is distributed under the terms of
 a permission notice identical to this one.
 .
 Permission is granted to copy and distribute translations of this
 document into another language, under the above conditions for
 modified versions, except that this permission notice may be included
 in translations approved by the Free Software Foundation instead of
 in the original English.
 .
 [See /usr/share/common-licenses/GPL-2 for text of GPL v2]
X-osamu: Translation licenses
 The duration of license is for Debian Reference Version 2.
 I have asked all contributors including translators to license their work
 under the same copyright as I did (GPL).  List of translator names are
 not included here.