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12. Patents.
A "contributor" is a copyright holder who authorizes use under this License of the Program
or a work on which the Program is based. The work thus licensed is called the contributor's
"contributor version".
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.
Each contributor grants you a non-exclusive, worldwide, royalty-free patent license under the
contributor's essential patent claims, to make, use, sell, offer for sale, import and otherwise run,
modify and propagate the contents of its contributor version.
In the following three paragraphs, a "patent license" is any express agreement or commitment,
however denominated, not to enforce a patent (such as an express permission to practice a
patent or covenant not to sue for patent infringement). To "grant" such a patent license to a
party means to make such an agreement or commitment not to enforce a patent against the
party.
If you convey a covered work, knowingly relying on a patent license, and the Corresponding
Source of the work is not available for anyone to copy, free of charge and under the terms of
this License, through a publicly available network server or other readily accessible means, then
you must either (1) cause the Corresponding Source to be so available, or (2) arrange to deprive
yourself of the benefit of the patent license for this particular work, or (3) arrange, in a manner
consistent with the requirements of this License, to extend the patent license to downstream
recipients. "Knowingly relying" means you have actual knowledge that, but for the patent license,
your conveying the covered work in a country, or your recipient's use of the covered work in a
country, would infringe one or more identifiable patents in that country that you have reason to
believe are valid.
If, pursuant to or in connection with a single transaction or arrangement, you convey, or
propagate by procuring conveyance of, a covered work, and grant a patent license to some
of the parties receiving the covered work authorizing them to use, propagate, modify or convey
a specific copy of the covered work, then the patent license you grant is automatically extended
to all recipients of the covered work and works based on it.
A patent license is "discriminatory" if it does not include within the scope of its coverage,
prohibits the exercise of, or is conditioned on the non-exercise of one or more of the rights that
are specifically granted under this License. You may not convey a covered work if you are a party
to an arrangement with a third party that is in the business of distributing software, under which
you make payment to the third party based on the extent of your activity of conveying the work,
and under which the third party grants, to any of the parties who would receive the covered
work from you, a discriminatory patent license (a) in connection with copies of the covered work
conveyed by you (or copies made from those copies), or (b) primarily for and in connection with
specific products or compilations that contain the covered work, unless you entered into that
arrangement, or that patent license was granted, prior to 28 March 2007.
Nothing in this License shall be construed as excluding or limiting any implied license or other
defenses to infringement that may otherwise be available to you under applicable patent law.
13. No Surrender of Others' Freedom.
If 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 convey a covered work so as to satisfy simultaneously your obligations
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