Additional IP Rights Grant (Patents)"This implementation" means the copyrightable works distributed byGoogle as part of the Polymer 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 thisimplementation of Polymer, where such license applies only to thosepatent claims, both currently owned or controlled by Google and acquiredin the future, licensable by Google that are necessarily infringed bythis implementation of Polymer. This grant does not include claimsthat would be infringed only as a consequence of further modification ofthis implementation. If you or your agent or exclusive licenseeinstitute or order or agree to the institution of patent litigationagainst any entity (including a cross-claim or counterclaim in alawsuit) alleging that this implementation of Polymer or any codeincorporated within this implementation of Polymer constitutesdirect or contributory patent infringement, or inducement of patentinfringement, then any patent rights granted to you under this Licensefor this implementation of Polymer shall terminate as of the datesuch litigation is filed.