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Date: Wed, 16 Jul 2014 10:31:01 +0200
From: Andreas Oberritter <obi@opendreambox.org>
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Subject: Re: [PATCH v3] libav: set LICENSE and LICENSE_FLAGS according to PACKAGECONFIG options
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On 16.07.2014 08:43, Matthieu CRAPET wrote:
> Hi again,
> 
>> Some optional parts of Libav are licensed under the GNU General Public License version 2 or later (GPL v2+). See the file COPYING.GPLv2 for details. 
>> None of these parts are used by default, you have to explicitly pass --enable-gpl to configure to activate them. In this case, Libav's license changes to GPL v2+."
> 
> I may misunderstood something here.
> 
> For example:
> - libavfiler. It contains yadif code which is GPLv2+ and frei0r code is LGPLv2.1+. Libavfiler is clearly contaminated: 

Yadif needs to be enabled explicitly with --enable-gpl. frei0r is 
disabled by default. If enabled, it's linked at runtime using dlopen. 
At least, this is what the 'configure' script suggests.

> LICENSE_libavfilter = "GPLv2+"
> - libavutils is 100% LGPL
> LICENSE_libavutils = " LGPLv2.1+"
> 
> Giving --enable-gpl to configure does not convert pure 100% LGPL licensed library to GPL license. Am I wrong?

If you combine GPL'ed and LGPL'ed code, the resulting binary will be GPL'ed.

https://en.wikipedia.org/wiki/GNU_Lesser_General_Public_License#Compatibility

Regards,
Andreas