Copyright for steam-installer source package in Mantic

Format: https://www.debian.org/doc/packaging-manuals/copyright-format/1.0/
Upstream-Name: steam-launcher
Files-Excluded:
 .gitignore
 COPYING
 Makefile
 README
 bin_steam.sh
 bin_steamdeps.py
 bootstraplinux_ubuntu12_32.tar.xz
 client-versions.json
 debian
 icons
 steam
 steam-key.asc
 steam.6
 steam.desktop
 steam.gpg
 steam*.list
 steam_subscriber_agreement.txt
 steamdeps
 tests
Disclaimer:
 The steam-installer package is Free Software but cannot be part of
 Debian. Its purpose is to download and install the non-free Steam client,
 so it depends on software outside Debian to function. As a result, it is
 distributed in the 'contrib' archive area (see Debian Policy §2.2.2 for
 details). Similar reasoning applies to the steam package, which is a
 transitional package that depends on steam-installer.
 .
 The license information listed in this file does not apply to the non-free
 Steam client that is downloaded by steam-installer, which is subject to
 legal terms available from 
 and .

Files:
 com.valvesoftware.Steam.metainfo.xml
Copyright:
 2017 Cosimo Cecchi
 2021 Collabora Ltd.
License: CC0-1.0

Files:
 buildutils/*.py
 steam_launcher/*.py
Copyright:
 2016-2018 Simon McVittie
 2017 Cosimo Cecchi
 2018-2021 Collabora Ltd.
License: Expat

Files:
 subprojects/steam-devices/*
Copyright:
 2018-2019 Valve Corporation
License: Expat

Files: debian/*
Copyright:
 2013-2018 Michael Gilbert 
 2018-2023 Simon McVittie
 2020-2021 Collabora Ltd.
 2023 Helge Kreutzmann
License: Expat

Files:
 debian/icons/*
Comment:
 Taken from adwaita-icon-theme
Copyright:
 © 2002-2018 Jakub Steiner
 © 2002-2018 Lapo Calamandrei
License: CC-BY-SA-3.0-US or LGPL-3
Comment:
 This work is licenced under the terms of either the GNU LGPL v3 or
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 To view a copy of the CC-BY-SA licence, visit
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 When attributing the artwork, using "GNOME Project" is enough.
 Please link to https://www.gnome.org where available.
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 See below for the full text of the CC-BY-SA-3.0.

License: CC0-1.0
 SPDX license expression "CC0-1.0": https://spdx.org/licenses/CC0-1.0.html
 .
 On Debian systems, the complete text of the CC0 Public Domain Dedication
 can be found in "/usr/share/common-licenses/CC0-1.0".

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