Re: libpng license 2.0

>Relicensing without explicit approval of all copyright holders is not
possible in general. It is possible only in a few exceptional cases.
For example:
* From GPLv2 to GPLv3 and from LGPLv2.1 to LGPLv3
* From LGPLv2.1 to GPLv2 and from LGPLv3 to GPLv3
* From 2-clause BSD to 3-clause BSD
* From EUPL to GPL/LGPL/MPL/EPL/CPL/CeCILL

And not much else.

I understand this is a problem, LLVM is currently going through this issue,
but I think it's worth at least considering it instead of just dismissing
it as infeasible off hand.

Does anyone have any clue how many contributors there have been to libPNG?

Ok, I cloned the git repo and ran `git shortlog --summary --numbered`

There are only 5 contributors throughout the history of the libpng repo

Here they are:

Andreas Dilger
Glenn Randers-Pehrson
Guy Schalnat
John Bowler
Mans Rullgard

Andreas Dilger has contributed 2089 commits, followed by John Bowler with
109, after that it's in the single digits commit count wise.

>

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