About libtiff

[Andras Timar]

Hello Julien,

On Tue, Apr 19, 2022 at 11:30 AM Julien Nabet <serval2412 at yahoo.fr> wrote:

> Hello,
>
> I noticed some bugs about dealing with TIFF images (see
> https://bugs.documentfoundation.org/show_bug.cgi?id=126152 for the meta).
>
> According to https://en.wikipedia.org/wiki/TIFF, TIFF is quite complex, I
> quote:
>
> "TIFF is a complex format, defining many tags of which typically only a
> few are used in each file. This led to implementations supporting very
> varying subsets of the format, a situation that gave rise to the joke that
> TIFF stands for *Thousands of Incompatible File Formats*.".
>
> So in https://gerrit.libreoffice.org/c/core/+/133108, I wondered if we
> could use Libtiff. Of course as Tomaž indicated it'll need lots of work.
> However Mike pointed out Luboš' commit about Webp to take example
>
>
> https://cgit.freedesktop.org/libreoffice/core/commit/?id=60eaa424c5e213f31227008e1ed66a646491a360
> ("support for the WebP image format (tdf#114532
> <https://bugs.documentfoundation.org/show_bug.cgi?id=114532>)") which can
> be a start.
>
> But before this, is libtiff license compatible?
>
> I mean, I retrieved source code of libtiff and m4/acinclude.m4 indicates
> (from line 192):
>
> dnl   This program is free software; you can redistribute it and/or modify
> it
> dnl   under the terms of the GNU General Public License as published by the
> dnl   Free Software Foundation; either version 2 of the License, or (at
> your
> dnl   option) any later version.
>
> If I remember well, GPL isn't sufficient, we also need LGPL, don't we?
>
>
You quoted the license of GNU Autoconf. Libtiff has a BSD-like licence.
https://gitlab.com/libtiff/libtiff/-/blob/master/COPYRIGHT

Best regards,
Andras
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