The following is an email exchange I had with Csaba Schnedier, the author of
the sophus GAP package.  I believe his messages indicate that the sophus
package is released under the GPL version 2 or later, just as GAP itself is.
However, he has never released another version of sophus, nor updated the
sophus web page, and all further attempts by me to reestablish contact have
been met with silence.


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Message-ID: <CAHCOHQn5Y2ry6mxwLV24HjanZe6gmpr7ZBC7A7QW-VbzyNApSA@mail.gmail.com>
Subject: Sophus license
From: Jerry James <loganjerry@gmail.com>
To: Csaba Schneider <csaba.schneider@gmail.com>
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Greetings,

I am part of a group working on adding GAP packages to the Fedora
Linux distribution, partly for use via sagemath and partly for those
who wish to use GAP directly.  We are interested in adding Sophus to
the collection, but are unable to find any statement of the license
under which Sophus is distributed.  Is such a statement available
somewhere?

Thank you and regards,
-- 
Jerry James
http://www.jamezone.org/
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Date: Fri, 29 Jul 2016 15:58:24 -0600
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Message-ID: <CAHCOHQkgRMtmU6nRqHBmKRc3PN6wrb-AbCyL2F1PuxqLhPfFWQ@mail.gmail.com>
Subject: Re: Sophus license
From: Jerry James <loganjerry@gmail.com>
To: Csaba Schneider <csaba.schneider@gmail.com>
Content-Type: text/plain; charset=UTF-8

On Thu, May 5, 2016 at 2:56 PM, Jerry James <loganjerry@gmail.com> wrote:
> I am part of a group working on adding GAP packages to the Fedora
> Linux distribution, partly for use via sagemath and partly for those
> who wish to use GAP directly.  We are interested in adding Sophus to
> the collection, but are unable to find any statement of the license
> under which Sophus is distributed.  Is such a statement available
> somewhere?

Is it your intention that Sophus should be distributed under the GPL,
version 2 or any later version, like GAP itself?  Thank you,
-- 
Jerry James
http://www.jamezone.org/
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From: Csaba Schneider <csaba.schneider@gmail.com>
Date: Tue, 9 Aug 2016 14:12:48 -0300
Message-ID: <CAAdb3uYZzz2JyW7se+XaQ4AGcZ_4E7BJWTZ=D_0Cr4=UCd5y3g@mail.gmail.com>
Subject: Re: Sophus license
To: Jerry James <loganjerry@gmail.com>
Content-Type: text/plain; charset=UTF-8

Hi Jerry

I am sorry for not replying earlier. The system put your mail into
spam. Look, I haven't thought much about under what sort of licence
should Sophus be distributed. I suppose I am happy with the same
licence what GAP has. What would I need to do to make this explicit?

Csaba.

On Fri, Jul 29, 2016 at 6:58 PM, Jerry James <loganjerry@gmail.com> wrote:
> On Thu, May 5, 2016 at 2:56 PM, Jerry James <loganjerry@gmail.com> wrote:
>> I am part of a group working on adding GAP packages to the Fedora
>> Linux distribution, partly for use via sagemath and partly for those
>> who wish to use GAP directly.  We are interested in adding Sophus to
>> the collection, but are unable to find any statement of the license
>> under which Sophus is distributed.  Is such a statement available
>> somewhere?
>
> Is it your intention that Sophus should be distributed under the GPL,
> version 2 or any later version, like GAP itself?  Thank you,
> --
> Jerry James
> http://www.jamezone.org/
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Subject: Re: Sophus license
From: Jerry James <loganjerry@gmail.com>
To: Csaba Schneider <csaba.schneider@gmail.com>
Content-Type: text/plain; charset=UTF-8

On Tue, Aug 9, 2016 at 11:12 AM, Csaba Schneider
<csaba.schneider@gmail.com> wrote:
> Hi Jerry
>
> I am sorry for not replying earlier. The system put your mail into
> spam. Look, I haven't thought much about under what sort of licence
> should Sophus be distributed. I suppose I am happy with the same
> licence what GAP has. What would I need to do to make this explicit?
>
> Csaba.

Thank you for digging my email out of your spam folder.  Sorry to take
a few days to reply.  It's been a busy week here.

All you really need to do is say something like "Sophus is distributed
under the GPL, version 2 or any later version." either on the Sophus
website or, preferably, in some file inside the Sophus distribution.
Many projects ship a copy of the GPL license terms with their
software, usually in a file named COPYING or LICENSE.  The text of GPL
2.0 is here if you would like to do so:

https://www.gnu.org/licenses/old-licenses/gpl-2.0.txt

That is the version GAP itself is distributed under.  Thank you for
considering the license question.  Regards,
-- 
Jerry James
http://www.jamezone.org/
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References: <CAHCOHQn5Y2ry6mxwLV24HjanZe6gmpr7ZBC7A7QW-VbzyNApSA@mail.gmail.com> <CAHCOHQkgRMtmU6nRqHBmKRc3PN6wrb-AbCyL2F1PuxqLhPfFWQ@mail.gmail.com> <CAAdb3uYZzz2JyW7se+XaQ4AGcZ_4E7BJWTZ=D_0Cr4=UCd5y3g@mail.gmail.com> <CAHCOHQ=u3LhZVA5DuLT+u2L8Ew+x1TWi0SCZTJ-qKSKkTe9sTw@mail.gmail.com>
From: Csaba Schneider <csaba.schneider@gmail.com>
Date: Wed, 17 Aug 2016 08:46:35 -0300
Message-ID: <CAAdb3uZPaGW7GGpXK9JAYomeZiGU6XDb81vzbdTHeZKCyB=84A@mail.gmail.com>
Subject: Re: Sophus license
To: Jerry James <loganjerry@gmail.com>
Content-Type: text/plain; charset=UTF-8

Dear Jerry

many thanks for your advice. I will resolve this in the next couple of
days and will let you know when it's done.

Csaba.

On Sat, Aug 13, 2016 at 8:31 PM, Jerry James <loganjerry@gmail.com> wrote:
> On Tue, Aug 9, 2016 at 11:12 AM, Csaba Schneider
> <csaba.schneider@gmail.com> wrote:
>> Hi Jerry
>>
>> I am sorry for not replying earlier. The system put your mail into
>> spam. Look, I haven't thought much about under what sort of licence
>> should Sophus be distributed. I suppose I am happy with the same
>> licence what GAP has. What would I need to do to make this explicit?
>>
>> Csaba.
>
> Thank you for digging my email out of your spam folder.  Sorry to take
> a few days to reply.  It's been a busy week here.
>
> All you really need to do is say something like "Sophus is distributed
> under the GPL, version 2 or any later version." either on the Sophus
> website or, preferably, in some file inside the Sophus distribution.
> Many projects ship a copy of the GPL license terms with their
> software, usually in a file named COPYING or LICENSE.  The text of GPL
> 2.0 is here if you would like to do so:
>
> https://www.gnu.org/licenses/old-licenses/gpl-2.0.txt
>
> That is the version GAP itself is distributed under.  Thank you for
> considering the license question.  Regards,
> --
> Jerry James
> http://www.jamezone.org/
