Change license to LGPL

[gautierhattenberger]

Changing the license of PPRZLINK to LGPL (with proper exceptions for static linking https://en.wikipedia.org/wiki/GPL_linking_exception) would make integration into non-GPL code easier.

Below is a list (maybe not complete yet) of contributors extracted from git + file headers, for the current pprzlink repository and also from the former code previously integrated to Paparazzi (paparazzi/paparazzi@22ca426 and before)

#### PAPARAZZI ####
git ls-tree -r -z --name-only HEAD -- conf/messages.* conf/units.xml sw/tools/generators/gen_messages.ml sw/airborne/subsystems/datalink/*transport* sw/airborne/subsystems/datalink/xbee* sw/airborne/subsystems/datalink/uart_print.h sw/lib/python/**/* sw/lib/ocaml/pprz.ml* sw/lib/ocaml/xbee.ml* sw/lib/ocaml/serial.ml* sw/lib/ocaml/logpprz.ml* sw/lib/ocaml/convert.c | xargs -0 -n1 git blame --line-porcelain HEAD |grep  "^author "|sort|uniq -c|sort -nr 
   3591 author Felix Ruess
   1882 author Gautier Hattenberger
   1718 author Pascal Brisset
   1169 author Antoine Drouin
    218 author Martin Mueller
    217 author Allen Ibara
    129 author Christophe De Wagter
     82 author Freek van Tienen
     61 author John Stowers
     27 author podhrmic
     27 author Cameron Lee
     26 author Oswald Berthold
     20 author Ewoud Smeur
     16 author dewagter
     15 author fvantienen
     12 author kirkscheper
     11 author Bruzzlee
      9 author Loic Drumettaz
      9 author Allen
      6 author Stephen Dwyer
      5 author Tobias Muench
      5 author LodewijkSikkel
      5 author agressiva
      4 author Pranay Sinha
      4 author karlito139
      3 author Paul Cox
      3 author guidoAI
      2 author Roland Meertens
      2 author rad
      2 author k.n.mcguire@tudelft.nl
      2 author Christoph Niemann
      1 author OSAM-UAV Team
      1 author Louis Dugrain
      1 author Eric Parsonage

grep "Copyright" conf/messages.* conf/units.xml sw/tools/generators/gen_messages.ml sw/airborne/subsystems/datalink/*transport* sw/airborne/subsystems/datalink/xbee* sw/airborne/subsystems/datalink/uart_print.h sw/lib/python/**/* sw/lib/ocaml/pprz.ml* sw/lib/ocaml/xbee.ml* sw/lib/ocaml/serial.ml* sw/lib/ocaml/logpprz.ml* sw/lib/ocaml/convert.c 
sw/tools/generators/gen_messages.ml: * Copyright (C) 2003-2008 ENAC, Pascal Brisset, Antoine Drouin
sw/airborne/subsystems/datalink/downlink_transport.h: * Copyright (C) 2003-2010 The Paparazzi Team
sw/airborne/subsystems/datalink/ivy_transport.c: * Copyright (C) 2003  Pascal Brisset, Antoine Drouin
sw/airborne/subsystems/datalink/ivy_transport.c: * Copyright (C) 2014  Gautier Hattenberger <gautier.hattenberger@enac.fr>
sw/airborne/subsystems/datalink/ivy_transport.h: * Copyright (C) 2003  Pascal Brisset, Antoine Drouin
sw/airborne/subsystems/datalink/ivy_transport.h: * Copyright (C) 2014  Gautier Hattenberger <gautier.hattenberger@enac.fr>
sw/airborne/subsystems/datalink/pprzlog_transport.c: * Copyright (C) 2014 Gautier Hattenberger <gautier.hattenberger@enac.fr>
sw/airborne/subsystems/datalink/pprzlog_transport.h: * Copyright (C) 2014 Gautier Hattenberger <gautier.hattenberger@enac.fr>
sw/airborne/subsystems/datalink/pprz_transport.c: * Copyright (C) 2006  Pascal Brisset, Antoine Drouin
sw/airborne/subsystems/datalink/pprz_transport.c: * Copyright (C) 2014  Gautier Hattenberger <gautier.hattenberger@enac.fr>
sw/airborne/subsystems/datalink/pprz_transport.h: * Copyright (C) 2003  Pascal Brisset, Antoine Drouin
sw/airborne/subsystems/datalink/pprz_transport.h: * Copyright (C) 2014  Gautier Hattenberger <gautier.hattenberger@enac.fr>
sw/airborne/subsystems/datalink/transport.h: * Copyright (C) 2011-2014 Gautier Hattenberger <gautier.hattenberger@enac.fr>
sw/airborne/subsystems/datalink/xbee24.h: * Copyright (C) 2009  ENAC, Pascal Brisset
sw/airborne/subsystems/datalink/xbee24.h: * Copyright (C) 2014  Gautier Hattenberger <gautier.hattenberger@enac.fr>
sw/airborne/subsystems/datalink/xbee868.h: * Copyright (C) 2009  ENAC, Pascal Brisset
sw/airborne/subsystems/datalink/xbee868.h: * Copyright (C) 2014  Gautier Hattenberger <gautier.hattenberger@enac.fr>
sw/airborne/subsystems/datalink/xbee.c: * Copyright (C) 2006  Pascal Brisset, Antoine Drouin
sw/airborne/subsystems/datalink/xbee.c: * Copyright (C) 2014  Gautier Hattenberger <gautier.hattenberger@enac.fr>
sw/airborne/subsystems/datalink/xbee.h: * Copyright (C) 2006  Pascal Brisset, Antoine Drouin
sw/airborne/subsystems/datalink/xbee.h: * Copyright (C) 2014  Gautier Hattenberger <gautier.hattenberger@enac.fr>
sw/airborne/subsystems/datalink/uart_print.h: * Copyright (C) 2005 Pascal Brisset, Antoine Drouin
sw/airborne/subsystems/datalink/uart_print.h: * Copyright (C) 2015 Gautier Hattenberger <gautier.hattenberger@enac.fr>
sw/lib/ocaml/pprz.ml: * Copyright (C) 2003 Pascal Brisset, Antoine Drouin
sw/lib/ocaml/pprz.mli: * Copyright (C) 2003 Pascal Brisset, Antoine Drouin
sw/lib/ocaml/xbee.ml: * Copyright (C) 2006 ENAC, Pascal Brisset, Antoine Drouin
sw/lib/ocaml/xbee.mli: * Copyright (C) 2006 ENAC, Pascal Brisset, Antoine Drouin
sw/lib/ocaml/serial.ml: * Copyright (C) 2004 CENA/ENAC, Pascal Brisset
sw/lib/ocaml/serial.mli: * Copyright (C) 2004 CENA/ENAC, Pascal Brisset
sw/lib/ocaml/logpprz.ml: * Copyright (C) 2003 Pascal Brisset, Antoine Drouin
sw/lib/ocaml/convert.c:   Copyright (C) 2004 Pascal Brisset, Antoine Drouin

#### PPRZLINK ####

git ls-tree -r -z --name-only HEAD -- **/* | xargs -0 -n1 git blame --line-porcelain HEAD |grep  "^author "|sort|uniq -c|sort -nr 
  10923 author Felix Ruess
   8295 author Gautier Hattenberger
    246 author Rijesh Augustine
     82 author HooperFly
     65 author kevindehecker
     50 author kirkscheper
     41 author Christophe De Wagter
     11 author Ewoud Smeur
      9 author Roland Meertens
      9 author guidoAI

Main contributors are well known and easy to reach. What about minor ones, former student and so on. Do we set a limit and where ?

[esden]

So what might help here is creating a list of the people we know have accounts on GitHub. This way we can address at least that part of yey/ney. Also I would limit the significant contribution to anything above 5 lines of code. It is somewhat arbitrary number but looking at the commits that is where I would personally draw the line. I have tried to find some references from other projects but I was not successful finding those yet.

Also anything below 50 lines of code should be easy to replace even if people in that contribution range do not agree with the license change.

• * agressiva @agressiva
• * Allen Ibara @aibara
• * Antoine Drouin @poine
• * Bruzzlee @Bruzzlee
• * Cameron Lee @camlee
• * Christophe De Wagter @dewagter
• * Gautier Hattenberger @gautierhattenberger
• * Ewoud Smeur @EwoudSmeur
• * Felix Ruess @flixr
• * Freek van Tienen @fvantienen
• * Guido de Croon @guidoAI
• * Hooperfly @hooperfly
• * John Stowers @nzjrs
• * Kevin van Hecke @kevindehecker
• * Kirk Scheper @kirkscheper
• * Lodewijk Sikkel @LodewijkSikkel
• * Loic Drumettaz @Drumettaz
• * Martin Mueller @martinmm
• * Oswald Berthold @x75
• * Pascal Brisset NA
• * podhrmic @podhrmic
• * Rijesh Augustine @rijeshaugustine
• * Roland Meertens @rmeertens
• * Stephen Dwyer @scdwyer
• * Tobias Muench @TobiasMue

I hope I added everyone based on the criteria I mentioned before. If you know anyone who has ??? next to their name, their github account nickname or have their email address/contact please add it in the comments here so we can approach them too.

If your name is listed in that list please state in the comments that you agree with the license change from GPL to LGPL + linking exception as @gautierhattenberger mentioned. :) Then we can check off your name in the list.

@gautierhattenberger you are welcome to take over my table into your post. Maybe that is the correct place to track progress of this issue. :)

Cheers,
Piotr

[podhrmic]

I have no problem with the licence change. My understanding is that this is for pprzlink only - are you considering to change the licence for the rest of pprz too?

[esden]

As far as I understand this is only pprz link related.

[podhrmic]

And I guess the motivation is so you can use pprzlink in other projects?

[esden]

Yes this will allow other projects including closed source ones to use PPRZLink linked into their codebase. This will allow in the future for more devices and software packages to interact with paparazzi based systems. This does not change the fact that if someone makes changes to PPRZLink and distribute it in any form including binary, they will have to publish their changes to the library. But it allows them to use the library non virally.

[aibara]

For what it's worth, I'd be fine with the license change.

On Jul 13, 2016 17:07, "Piotr Esden-Tempski" notifications@github.com
wrote:

Yes this will allow other projects including closed source ones to use
PPRZLink linked into their codebase. This will allow in the future for more
devices and software packages to interact with paparazzi based systems.
This does not change the fact that if someone makes changes to PPRZLink and
distribute it in any form including binary, they will have to publish their
changes to the library. But it allows them to use the library non virally.

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[fvantienen]

I have no problem with the license change 👍

[rmeertens]

I'm fine with everything.

[martinmm]

Fine for me for pprzlink

[flixr]

I support changing the pprzlink license to LGPL with linking exception.

[gautierhattenberger]

I indeed agree with the license change

[nzjrs]

I agree with the license change from GPLv3 to LGPL

On 14 July 2016 at 10:42, Piotr Esden-Tempski notifications@github.com
wrote:

So what might help here is creating a list of the people we know have
accounts on GitHub. This way we can address at least that part of yey/ney.
Also I would limit the significant contribution to anything above 5 lines
of code. It is somewhat arbitrary number but looking at the commits that is
where I would personally draw the line. I have tried to find some
references from other projects but I was not successful finding those yet.

Also anything below 50 lines of code should be easy to replace even if
people in that contribution range do not agree with the license change.

• * agressiva @agressiva https://github.com/agressiva
• * Allen Ibara @aibara https://github.com/aibara
• * Antoine Drouin @poine https://github.com/poine
• * Bruzzlee @Bruzzlee https://github.com/bruzzlee
• * Cameron Lee @camlee https://github.com/camlee
• * Christophe De Wagter @dewagter https://github.com/dewagter
• * Gautier Hattenberger @gautierhattenberger
  https://github.com/gautierhattenberger
• * Ewoud Smeur @EwoudSmeur https://github.com/EwoudSmeur
• * Felix Ruess @flixr https://github.com/flixr
• * Freek van Tienen @fvantienen https://github.com/fvantienen
• * Guido de Croon @guidoAI https://github.com/guidoAI
• * Hooperfly @hooperfly https://github.com/hooperfly
• * John Stowers @nzjrs https://github.com/nzjrs
• * Kevin van Hecke @kevindehecker https://github.com/kevindehecker
• * Kirk Scheper @kirkscheper https://github.com/kirkscheper
• * Lodewijk Sikkel @LodewijkSikkel https://github.com/LodewijkSikkel
• * Loic Drumettaz ???
• * Martin Mueller @martinmm https://github.com/martinmm
• * Oswald Berthold @x75 https://github.com/x75
• * Pascal Brisset NA
• * podhrmic @podhrmic https://github.com/podhrmic
• * Rijesh Augustine @rijeshaugustine
  https://github.com/rijeshaugustine
• * Roland Meertens @rmeertens https://github.com/rmeertens
• * Stephen Dwyer @scdwyer https://github.com/scdwyer
• * Tobias Muench @TobiasMue https://github.com/TobiasMue

I hope I added everyone based on the criteria I mentioned before. If you
know anyone who has ??? next to their name, their github account nickname
or have their email address/contact please add it in the comments here so
we can approach them too.

If your name is listed in that list please state in the comments that you
agree with the license change from GPLv3 to LGPL + linking exception as
@gautierhattenberger https://github.com/gautierhattenberger mentioned.
:) Then we can check off your name in the list.

@gautierhattenberger https://github.com/gautierhattenberger you are
welcome to take over my table into your post. Maybe that is the correct
place to track progress of this issue. :)

Cheers,
Piotr

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[flixr]

We currently have GPLv2 (or later), updated it above...

[EwoudSmeur]

I agree

[poine]

I agree to the proposed license change.

On Jul 14, 2016 1:55 AM, "Piotr Esden-Tempski" notifications@github.com
wrote:

So what might help here is creating a list of the people we know have
accounts on GitHub. This way we can address at least that part of yey/ney.
Also I would limit the significant contribution to anything above 5 lines
of code. It is somewhat arbitrary number but looking at the commits that is
where I would personally draw the line. I have tried to find some
references from other projects but I was not successful finding those yet.

Also anything below 50 lines of code should be easy to replace even if
people in that contribution range do not agree with the license change.

• * Felix Ruess @flixr https://github.com/flixr
• * Gautier Hattenberger @gautierhattenberger
  https://github.com/gautierhattenberger
• * Pascal Brisset NA
• * Antoine Drouin @poine https://github.com/poine
• * Martin Mueller @martinmm https://github.com/martinmm
• * Allen Ibara @aibara https://github.com/aibara
• * Christophe De Wagter @dewagter https://github.com/dewagter
• * Freek van Tienen @fvantienen https://github.com/fvantienen
• * John Stowers ???
• * podhrmic @podhrmic https://github.com/podhrmic
• * Cameron Lee ???
• * Oswald Berthold ???
• * Ewoud Smeur @EwoudSmeur https://github.com/EwoudSmeur
• * fvantienen @fvantienen https://github.com/fvantienen
• * kirkscheper @kirkscheper https://github.com/kirkscheper
• * Bruzzlee ???
• * Loic Drumettaz ???
• * Stephen Dwyer @scdwyer https://github.com/scdwyer
• * Tobias Muench @TobiasMue https://github.com/TobiasMue
• * LodewijkSikkel @LodewijkSikkel https://github.com/LodewijkSikkel
• * agressiva ???
• * Rijesh Augustine ???
• * Hooperfly @hooperfly https://github.com/hooperfly
• * kevindehecker @kevindehecker https://github.com/kevindehecker
• * Roland Meertens @rmeertens https://github.com/rmeertens
• * guidoAI ???

I hope I added everyone based on the criteria I mentioned before. If you
know anyone who has ??? next to their name, their github account nickname
or have their email address/contact please add it in the comments here so
we can approach them too.

If your name is listed in that list please state in the comments that you
agree with the license change from GPLv3 to LGPL + linking exception as
@gautierhattenberger https://github.com/gautierhattenberger mentioned.
:) Then we can check off your name in the list.

@gautierhattenberger https://github.com/gautierhattenberger you are
welcome to take over my table into your post. Maybe that is the correct
place to track progress of this issue. :)

Cheers,
Piotr

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