Additional IP Rights Grant (Patents)------------------------------------ "These implementations" means the copyrightable works that implement the WebMcodecs 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 tomake, have made, use, offer to sell, sell, import, transfer, and otherwiserun, modify and propagate the contents of these implementations of WebM, wheresuch license applies only to those patent claims, both currently owned byGoogle and acquired in the future, licensable by Google that are necessarilyinfringed by these implementations of WebM. This grant does not include claimsthat would be infringed only as a consequence of further modification of theseimplementations. If you or your agent or exclusive licensee institute or orderor agree to the institution of patent litigation or any other patentenforcement activity against any entity (including a cross-claim orcounterclaim in a lawsuit) alleging that any of these implementations of WebMor any code incorporated within any of these implementations of WebMconstitutes direct or contributory patent infringement, or inducement ofpatent infringement, then any patent rights granted to you under this Licensefor these implementations of WebM shall terminate as of the date suchlitigation is filed.