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Re: [Fsfe-france] GPL vs LGPL vs closed source


From: Laurent GUERBY
Subject: Re: [Fsfe-france] GPL vs LGPL vs closed source
Date: Thu, 26 Jul 2007 23:16:17 +0200

On Thu, 2007-07-26 at 17:24 +0200, François TOURDE wrote:
> La LGPL quand à elle permet à des librairies (par exemple) d'être
> incluses dans un code propriétaire, sans que celui-ci soit soumis à
> une quelconque licence.

Il y a quand même une contrainte car l'utilisateur doit quand même
pouvoir techniquement "relinker" B avec une version differente de
la librairies LGPL en question. Linker B en dynamique avec A est
suffisant pour remplir cette condition et c'est le cas le plus commun.
Pour un link statique il faut travailler un peu plus pour remplir
la condition (plus rare, je n'ai jamais vu en pratique).

En LGPLv3 ca donne en 4.d.1 :

http://www.gnu.org/licenses/lgpl.html

"Use a suitable shared library mechanism for linking with the Library. A
suitable mechanism is one that (a) uses at run time a copy of the
Library already present on the user's computer system, and (b) will
operate properly with a modified version of the Library that is
interface-compatible with the Linked Version."

LGPLv2 6.b :

http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html

"Use a suitable shared library mechanism for linking with the Library. A
suitable mechanism is one that (1) uses at run time a copy of the
library already present on the user's computer system, rather than
copying library functions into the executable, and (2) will operate
properly with a modified version of the library, if the user installs
one, as long as the modified version is interface-compatible with the
version that the work was made with."

Laurent





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