Additional IP Rights Grant (Patents)

"This implementation" means the copyrightable works distributed by

Google as part of the WebM Project.

Google 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,

transfer, and otherwise run, modify and propagate the contents of this

implementation of VP8, where such license applies only to those patent

claims, both currently owned by Google and acquired in the future,

licensable by Google that are necessarily infringed by this

implementation of VP8. This grant does not include claims that would be

infringed only as a consequence of further modification of this

implementation. If you or your agent or exclusive licensee institute or

order or agree to the institution of patent litigation against any

entity (including a cross-claim or counterclaim in a lawsuit) alleging

that this implementation of VP8 or any code incorporated within this

implementation of VP8 constitutes direct or contributory patent

infringement, or inducement of patent infringement, then any patent

rights granted to you under this License for this implementation of VP8

shall terminate as of the date such litigation is filed.