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Additional IP Rights Grant (Patents)
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"This implementation" means the copyrightable works distributed by
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Google as part of the WebM Project.
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Google hereby grants to you a perpetual, worldwide, non-exclusive,
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no-charge, royalty-free, irrevocable (except as stated in this section)
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patent license to make, have made, use, offer to sell, sell, import,
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transfer, and otherwise run, modify and propagate the contents of this
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implementation of VP8, where such license applies only to those patent
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claims, both currently owned by Google and acquired in the future,
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licensable by Google that are necessarily infringed by this
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implementation of VP8. This grant does not include claims that would be
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infringed only as a consequence of further modification of this
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implementation. If you or your agent or exclusive licensee institute or
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order or agree to the institution of patent litigation against any
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entity (including a cross-claim or counterclaim in a lawsuit) alleging
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that this implementation of VP8 or any code incorporated within this
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implementation of VP8 constitutes direct or contributory patent
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infringement, or inducement of patent infringement, then any patent
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rights granted to you under this License for this implementation of VP8
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shall terminate as of the date such litigation is filed.