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