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Additional IP Rights Grant (Patents)
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"These implementations" means the copyrightable works that implement the WebM
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codecs distributed by Google as part of the WebM Project.
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Google hereby grants to you a perpetual, worldwide, non-exclusive, no-charge,
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royalty-free, irrevocable (except as stated in this section) patent license to
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make, have made, use, offer to sell, sell, import, transfer, and otherwise
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run, modify and propagate the contents of these implementations of WebM, where
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such license applies only to those patent claims, both currently owned by
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Google and acquired in the future, licensable by Google that are necessarily
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infringed by these implementations of WebM. This grant does not include claims
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that would be infringed only as a consequence of further modification of these
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implementations. If you or your agent or exclusive licensee institute or order
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or agree to the institution of patent litigation or any other patent
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enforcement activity against any entity (including a cross-claim or
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counterclaim in a lawsuit) alleging that any of these implementations of WebM
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or any code incorporated within any of these implementations of WebM
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constitute direct or contributory patent infringement, or inducement of
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patent infringement, then any patent rights granted to you under this License
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for these implementations of WebM shall terminate as of the date such
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litigation is filed.
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