1Additional IP Rights Grant (Patents) 2 3"This implementation" means the copyrightable works distributed by 4Google as part of the Polymer project. 5 6Google hereby grants to You a perpetual, worldwide, non-exclusive, 7no-charge, royalty-free, irrevocable (except as stated in this section) 8patent license to make, have made, use, offer to sell, sell, import, 9transfer and otherwise run, modify and propagate the contents of this 10implementation of Polymer, where such license applies only to those 11patent claims, both currently owned or controlled by Google and acquired 12in the future, licensable by Google that are necessarily infringed by 13this implementation of Polymer. This grant does not include claims 14that would be infringed only as a consequence of further modification of 15this implementation. If you or your agent or exclusive licensee 16institute or order or agree to the institution of patent litigation 17against any entity (including a cross-claim or counterclaim in a 18lawsuit) alleging that this implementation of Polymer or any code 19incorporated within this implementation of Polymer constitutes 20direct or contributory patent infringement, or inducement of patent 21infringement, then any patent rights granted to you under this License 22for this implementation of Polymer shall terminate as of the date 23such litigation is filed. 24