[Ctk-developers] CTK range slider

[Julien Finet]

Hi Massimo,

I gave a look at QLC+ and it seems to be a cool project, nice job !

Thanks for your interest in CTK.
Let me first begin by saying that I am not a license expert but I cc-ed the
CTK community and our license experts at Kitware.

Having said, here are my thoughts:
  - The CTK community has chosen the Apache 2 license to give access of CTK
to most people with less restrictions as possible (in the true open-source
kind of way :-) ).
  - Therefore, if you don't hear otherwise, we would be happy to grant QLC+
access of CTK if you keep the license header in the CTK files you embed in
your project.
  - I would strongly suggest that you change your license to a more recent
version of GPL (v3?), or even better, to a more permissive license (such as
Apache 2) to fully embrace the "open source" philosophy. Indeed, the
licensing issue of CTK within QLC+ does not (seem to) come from Apache 2,
but from the very restrictive GPLv2 (that is not even compatible with GPLv3
code). In the long run, it would be very counter productive for you guys to
refrain yourself from re-using all the open source libraries available and
you would waste lots of time trying to reinvent the wheel each time.
  - Finally, we would surely appreciate (but it is not mandatory) that you
publicly mention CTK in your project. For example, on your website (an
acknowledgment page maybe ?) or/and in your software (in an "About" dialog).
  - Feel free to contribute patch (using the github pull request mechanism)
if you found and fixed bugs or added features.

Best regards,
Julien.



On Mon, Oct 7, 2013 at 4:31 AM, Massimo Callegari <massimocallegari at yahoo.it
> wrote:

> Hello Julien,
> I found your email address on Github.
> First of all, I just want to say you're doing a great job with the CTK
> project !
>
> I am the maintainer of another open source project called QLC+:
> http://qlcplus.sourceforge.net/index.shtml
> It's released under the GPLv2 license.
>
> Yesterday I was looking around for a solution about a range slider in Qt
> and I found yours.
> So I've got 2 questions:
> - I would like to ask the permission to the CTK team to use the
> ctkRangeSlider class in my project
> - since you release CTK with the Apache 2.0 license, according to this page
> http://www.apache.org/licenses/GPL-compatibility.html
> it seems it is not compatible with GPLv2, so I'm wondering if you ever
> face issues like this.
> In case, would it be possible to grant to the QLC+ project a "special"
> release of the range slider class under GPLv2 ?
>
> Thank you very much in advance !
>
> Regards,
> Massimo
>
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