Clarify project copyright and license, use SPDX

Changes/additions in AlsaMixer.app over Mixer.app were lacking a
copyright information and and license specifications. Add the missing
bits, using a SPDX-License-Identifier.

Documentation for the change follows.
---------------------------------------------------

From petr.hlavka@avast.com Wed May  2 10:57:44 2018
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From: =?UTF-8?Q?Hl=C3=A1vka=2C_Petr?= <petr.hlavka@avast.com>
Date: Wed, 2 May 2018 10:57:36 +0200
Message-ID: <CACiAdzoA3hsfNG_5Xm-2wYJyZaEYH=xhK=8BrUq5YWVZRYncDg@mail.gmail.com>
Subject: Re: AlsaMixer.app - license?
To: Andreas Metzler <ametzler@debian.org>
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--94eb2c0a95da487efd056b354749
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Hello Andreas,

yes, I'm the author of modification to original Mixer.app (AlsaMixer.app).
They should be licensed under the same license as Mixer.app, some info is
available in
http://repo.or.cz/dockapps.git/blob_plain/HEAD:/AlsaMixer.app/README ,
section Copyright.

  Regards, Petr Hlavka.

On Mon, Apr 30, 2018 at 2:50 PM, Andreas Metzler <ametzler@debian.org>
wrote:

> Dear Mr Hl=C3=A1vka,
>
> I guess that you are the original author of AlsaMixer.app
> <https://www.dockapps.net/alsamixerapp>. If that is not case I am
> sorry for bothering you unnecessaly but would appreciate if you told
> me. - Thanks in advance
>
> On the other hand if you are the author it would be helpful if you could
> clarify the question of licensing. AlsaMixer.app is based on Mixer.app
> which is licensed under GNU General Public License version 2 or later.
> The modifications and additions for AlsaMixer.app only a carry a
> copyright info but no licensing info:
>
> Copyright
> --------------------------------------------------------------
> AlsaMixer.app, 2004, Petr Hlavka
> [...]
> // AChannel.cc, Petr Hlavka, 2004
>
> I guess that your contributions are also available under GPL v2 or
> later. Could you confirm this?
>
> Thanks in advance, kind Regards
>
> Andreas Metzler
>

--94eb2c0a95da487efd056b354749
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<div dir=3D"ltr">Hello Andreas,<div><br></div><div>yes, I&#39;m the author =
of modification to original Mixer.app (AlsaMixer.app). They should be licen=
sed under the same license as Mixer.app, some info is available in=C2=A0<a =
href=3D"http://repo.or.cz/dockapps.git/blob_plain/HEAD:/AlsaMixer.app/READM=
E">http://repo.or.cz/dockapps.git/blob_plain/HEAD:/AlsaMixer.app/README</a>=
 , section Copyright.</div><div><br></div><div>=C2=A0 Regards, Petr Hlavka.=
</div></div><div class=3D"gmail_extra"><br><div class=3D"gmail_quote">On Mo=
n, Apr 30, 2018 at 2:50 PM, Andreas Metzler <span dir=3D"ltr">&lt;<a href=
=3D"mailto:ametzler@debian.org" target=3D"_blank">ametzler@debian.org</a>&g=
t;</span> wrote:<br><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0=
 .8ex;border-left:1px #ccc solid;padding-left:1ex">Dear Mr Hl=C3=A1vka,<br>
<br>
I guess that you are the original author of AlsaMixer.app<br>
&lt;<a href=3D"https://www.dockapps.net/alsamixerapp" rel=3D"noreferrer" ta=
rget=3D"_blank">https://www.dockapps.net/<wbr>alsamixerapp</a>&gt;. If that=
 is not case I am <br>
sorry for bothering you unnecessaly but would appreciate if you told<br>
me. - Thanks in advance<br>
<br>
On the other hand if you are the author it would be helpful if you could<br=
>
clarify the question of licensing. AlsaMixer.app is based on Mixer.app<br>
which is licensed under GNU General Public License version 2 or later.<br>
The modifications and additions for AlsaMixer.app only a carry a<br>
copyright info but no licensing info:<br>
<br>
Copyright<br>
------------------------------<wbr>------------------------------<wbr>--<br=
>
AlsaMixer.app, 2004, Petr Hlavka<br>
[...]<br>
// AChannel.cc, Petr Hlavka, 2004<br>
<br>
I guess that your contributions are also available under GPL v2 or<br>
later. Could you confirm this?<br>
<br>
Thanks in advance, kind Regards<br>
<span class=3D"HOEnZb"><font color=3D"#888888"><br>
Andreas Metzler<br>
</font></span></blockquote></div><br></div>

AlsaMixer.app/AMixer/AChannel.cc

@@ -1,4 +1,8 @@
-// AChannel.cc, Petr Hlavka, 2004
+// AChannel.cc
+//
+// Copyright (C) 2004, Petr Hlavka
+//
+// SPDX-License-Identifier: GPL-2.0+
 
 #include "AMixer.h"
 #include "AItem.h"

AlsaMixer.app/AMixer/AChannel.h

@@ -1,4 +1,8 @@
-// AChannel.h, Petr Hlavka, 2004
+// AChannel.h
+//
+// Copyright (C) 2004, Petr Hlavka
+//
+// SPDX-License-Identifier: GPL-2.0+
 
 #ifndef ACHANNEL_H
 #define ACHANNEL_H

AlsaMixer.app/AMixer/AItem.cc

@@ -1,4 +1,8 @@
-// AItem.cc, Petr Hlavka, 2004
+// AItem.cc
+//
+// Copyright (C) 2004, Petr Hlavka
+//
+// SPDX-License-Identifier: GPL-2.0+
 
 #include "AItem.h"
 #include "AMixer.h"

AlsaMixer.app/AMixer/AItem.h

@@ -1,4 +1,8 @@
-// AItem.h, Petr Hlavka, 2004
+// AItem.h
+//
+// Copyright (C) 2004, Petr Hlavka
+//
+// SPDX-License-Identifier: GPL-2.0+
 
 #ifndef AITEM_H
 #define AITEM_H

AlsaMixer.app/AMixer/AMixer.cc

@@ -1,4 +1,8 @@
-// AMixer.cc, Petr Hlavka, 2004
+// AMixer.cc
+//
+// Copyright (C) 2004, Petr Hlavka
+//
+// SPDX-License-Identifier: GPL-2.0+
 
 #include "AMixer.h"
 #include "AItem.h"

AlsaMixer.app/AMixer/AMixer.h

@@ -1,4 +1,8 @@
-// AMixer.h, Petr Hlavka, 2004
+// AMixer.h
+//
+// Copyright (C) 2004, Petr Hlavka
+//
+// SPDX-License-Identifier: GPL-2.0+
 
 #ifndef AMIXER_H
 #define AMIXER_H

AlsaMixer.app/COPYING

@@ -337,3 +337,12 @@ proprietary programs.  If your program is a subroutine library, you may
 consider it more useful to permit linking proprietary applications with the
 library.  If this is what you want to do, use the GNU Lesser General
 Public License instead of this License.
+
+---------------------------------------------------------------------------
+Note:
+Individual files contain the following tag instead of the full license text.
+
+    SPDX-License-Identifier:    GPL-2.0+
+
+This enables machine processing of license information based on the SPDX
+License Identifiers that are here available: http://spdx.org/licenses/

AlsaMixer.app/Main.cc

@@ -1,7 +1,8 @@
 //
-//  Mixer.app
+//  Mixer.app / AlsaMixer.app
 //
 //  Copyright (c) 1998-2002 Per Liden
+//  Copyright (C) 2004, Petr Hlavka
 //
 //  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

AlsaMixer.app/Makefile

@@ -1,6 +1,10 @@
 #
-# Mixer.app Makefile
+# AlsaMixer.app Makefile
 #
+# Copyright (c) 1998-2002 Per Liden
+# Copyright (C) 2004, Petr Hlavka
+#
+# SPDX-License-Identifier: GPL-2.0+
 
 DESTDIR =
 GNUSTEP_BINDIR = /usr/local/GNUstep/Apps/AlsaMixer.app

AlsaMixer.app/Mixer.cc

@@ -1,7 +1,8 @@
 //
-//  Mixer.app
+//  Mixer.app / AlsaMixer.app
 //
 //  Copyright (c) 1998-2002 Per Liden
+//  Copyright (C) 2004, Petr Hlavka
 //
 //  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

AlsaMixer.app/Mixer.h

@@ -1,7 +1,8 @@
 //
-//  Mixer.app
+//  Mixer.app / AlsaMixer.app
 //
 //  Copyright (c) 1998-2002 Per Liden
+//  Copyright (C) 2004, Petr Hlavka
 //
 //  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

AlsaMixer.app/olddoc/ChangeLog.Mixer.app

@@ -3,7 +3,7 @@ Version		Description
 1.8.0		- Released 2002-09-15
 		- Now supports all mixer sources. NOTE! The source names have
 		  been changed. See "Mixer.app -h".
-		- Added alternative skin submitted by Hans D. <barross@web.de>.
+		- Added alternative skin submitted by Hans Dembinski <barross@web.de>.
 		- Fixed warnings when compiling with GCC 3.2.
 		- Added OpenBSD support (thanks to ptiJo <ptiJo@noos.fr>).