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