La licencias de software libre han tenido que ir adaptando sus clausulas para incluir clausulas antipantentes.
En GPL v2 se incluye la siguiente clausula en la sección 6:
You may not impose any further
restrictions on the recipients' exercise of the rights granted herein.
You are not responsible for enforcing compliance by third parties to
this License.
En GPL v2 se incluye la siguiente clausula en la sección 7:
If, as a consequence of a court judgment or allegation of patent
infringement or for any other reason (not limited to patent issues),
conditions are imposed on you (whether by court order, agreement or
otherwise) that contradict the conditions of this License, they do not
excuse you from the conditions of this License. If you cannot
distribute so as to satisfy simultaneously your obligations under this
License and any other pertinent obligations, then as a consequence you
may not distribute the Program at all. For example, if a patent
license would not permit royalty-free redistribution of the Program by
all those who receive copies directly or indirectly through you, then
the only way you could satisfy both it and this License would be to
refrain entirely from distribution of the Program.
En GPL v3 y Affero GPL v3 se incluye la siguiente clausula en la sección 10:
you may not impose a license fee, royalty, or other charge for
exercise of rights granted under this License, and you may not initiate
litigation (including a cross-claim or counterclaim in a lawsuit)
alleging that any patent claim is infringed by making, using, selling,
offering for sale, or importing the Program or any portion of it.
En GPL v3 y Affero GPL v3 se incluye la siguiente clausula en la sección 11:
A contributor's “essential patent claims” are all patent claims
owned or controlled by the contributor, whether already acquired or
hereafter acquired, that would be infringed by some manner, permitted
by this License, of making, using, or selling its contributor version,
but do not include claims that would be infringed only as a
consequence of further modification of the contributor version. For
purposes of this definition, “control” includes the right to grant
patent sublicenses in a manner consistent with the requirements of
this License.
En Apache License 2.0 se incluye la siguiente clausula en la sección 3:
Subject to the terms and conditions of this License, each Contributor
hereby grants to You a perpetual, worldwide, non-exclusive, no-charge,
royalty-free, irrevocable (except as stated in this section) patent
license to make, have made, use, offer to sell, sell, import, and
otherwise transfer the Work, where such license applies only to those
patent claims licensable by such Contributor that are necessarily
infringed by their Contribution(s) alone or by combination of their
Contribution(s) with the Work to which such Contribution(s) was
submitted.
If You institute patent litigation against any entity (including a
cross-claim or counterclaim in a lawsuit) alleging that the Work or a
Contribution incorporated within the Work constitutes direct or
contributory patent infringement, then any patent licenses granted to
You under this License for that Work shall terminate as of the date such
litigation is filed.
En MPL 2.0 se incluye la siguiente clausula en la sección 5:
If You initiate litigation against any entity by asserting a patent
infringement claim (excluding declaratory judgment actions,
counter-claims, and cross-claims) alleging that a Contributor Version
directly or indirectly infringes any patent, then the rights granted to
You by any and all Contributors for the Covered Software under Section
2.1 of this License shall terminate.
En MPL 2.0 se incluye la siguiente clausula en la sección 2:
Each Contributor hereby grants You a world-wide, royalty-free,
non-exclusive license: [...] under Patent Claims of such Contributor to
make, use, sell, offer for sale, have made, import, and otherwise
transfer either its Contributions or its Contributor Version.
Notwithstanding Section 2.1(b) above, no patent license is granted by a
Contributor: [...] under Patent Claims infringed by Covered Software in
the absence of its Contributions.
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