Clarify project copyright and license, use SPDX

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>