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Re: License of gpclib

Hi Andreas

(I never received the mail of 09 June from Charles. I don't know what address he sent it to.)

I have consulted GPC author Alan Murta and I regret to tell you that there are no plans to change the licensing arrangements for GPC. He has asked me to mention that there are other, free, polygon cliiping libraries, such as Clipper (http://www.angusj.com/delphi/clipper.php) which you may wish to use instead.

With best wishes


On 01/07/2021 09:59, Andreas Tille wrote:
Hi again,

I'm a member of the Debian R packaging team.  Our list did not received
any response to Charles' mail nor did Charles contacted us regarding a
private mail.  So I guess it might have slipped through somehow in your
busy life and I'd like to repeat this question which is to some extend
urgent for several packaging projects that are depending from R gpclib.

It would be really great if you would consider relicensing the code
under a free license.

Kind regards


On Wed, Jun 09, 2021 at 10:08:42PM +0900, Charles Plessy wrote:
Dear Toby,

I am contacting you as you were involved in commercial licensing of the
GPC library.


Although the University of Manchester does not distribute it anymore, it
is still used in the R package gpclib, where the University is listed
as copyright holder with a license that prohibits commercial use.

This is unfortunate for Free software projects such as Debian, as we
require that Free software licenses do not discriminate fields of
endeavor, including commercial use.  However, we would be keen to
redistribute the gpclib if it were Free, and it would allow us to
package some software that depend on it.

Is there a way you could help us to get the gpclib relicensed by the
University of Mancheter under a Free license ?

(CCed: the Debian R mailing list.  Please note it is publicly archived.)

Best regards,

Charles Plessy

Charles Plessy                         Nagahama, Yomitan, Okinawa, Japan
Debian Med packaging team         http://www.debian.org/devel/debian-med
Tooting from work,           https://mastodon.technology/@charles_plessy
Tooting from home,                 https://framapiaf.org/@charles_plessy

Honorary Reader
Department of Computer Science, The University of Manchester
www.cs.man.ac.uk/~toby @tobyhoward

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