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Re: Compatibility of LGPL-3+ and LGPL-2.1 in same library.

From Soren Stoutner@21:1/5 to All on Thu Jun 6 10:30:53 2024

Copy: [email protected] (Arun Kumar Pariyar)

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According to the GNU compatibility matrix

https://www.gnu.org/licenses/gpl-faq.html#AllCompatibility[1]

the answer is that, without permission from the original copyright owners, you can
combine the code if you re-license the combination as either GPLv3 or GPLv3+. If you want
the combined code to be LGPLv3+, you would need the permission of the copyright holders
of the LGPLv2.1 to re-license it. (This is described in the top part of the chart in the link
above.)

Note that this answer is specific to the situation of mixing code that is LGPLv3+ and
LGPLv2.1 in the same library. In the different scenario of having one library that is LGPLv2.1
and another that is LGPLv3+ in the same project, you can mix them without any issues or
the need to re-license any code. (This is described in the bottom of the chart in the link
above.)

On Thursday, June 6, 2024 6:53:32 AM MST Arun Kumar Pariyar wrote:

Dear Legal Team,

Can LGPL-3+ and LGPL-2.1 licensed code be used together in the same library, or is re-licensing required?
Your guidance on their compatibility would be
greatly appreciated.

Regards,
~ Arun Kumar Pariyar

--
Soren Stoutner
[email protected]

--------
[1] https://www.gnu.org/licenses/gpl-faq.html#AllCompatibility

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<body>According to the GNU compatibility matrix
 <a href="https://www.gnu.org/licenses/gpl-faq.html#AllCompatibility">https://www.gnu.org/licenses/gpl-faq.html#AllCompatibility</a>
 the answer is that, without permission from the original copyright owners, you can combine the code if you re-license the combination as either GPLv3 or GPLv3+.  If you want
the combined code to be LGPLv3+, you would need the permission of the copyright holders of the LGPLv2.1 to re-license it.  (This is described in the top part of the chart in the link above.)
 Note that this answer is specific to the situation of mixing code that is LGPLv3+ and LGPLv2.1 in the same library.  In the different scenario of having one library that is
LGPLv2.1 and another that is LGPLv3+ in the same project, you can mix them without any issues or the need to re-license any code.  (This is described in the bottom of the chart in the link above.)
 On Thursday, June 6, 2024 6:53:32 AM MST Arun Kumar Pariyar wrote:
> Dear Legal Team,
> > Can LGPL-3+ and LGPL-2.1 licensed code be used together in the same library,
> or is re-licensing required?
> Your guidance on their compatibility would be
> greatly appreciated.
> > Regards,
> ~ Arun Kumar Pariyar
> -- 
Soren Stoutner
[email protected]
</body>
</html>
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From Andreas Metzler@21:1/5 to [email protected] on Thu Jun 6 19:40:01 2024

On 2024-06-06 Arun Kumar Pariyar <[email protected]> wrote:

Dear Legal Team,

Can LGPL-3+ and LGPL-2.1 licensed code be used together in the same
library, or is re-licensing required?
Your guidance on their compatibility would be greatly appreciated.

Hello,

AFAIK, please doublecheck:

LGPL 2.1 (3) allows relicensing under GPL-2+, so the combined work would effectively be GPL-3+.

cu Andreas

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Re: Compatibility of LGPL-3+ and LGPL-2.1 in same library.

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