The Tor Browser / file revision

 Additional IP Rights Grant (Patents)

 "This implementation" means the copyrightable works distributed by

 Google as part of the LibYuv code package.

 Google hereby grants to you a perpetual, worldwide, non-exclusive,

 no-charge, 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 this

 implementation of the LibYuv code package, where such license applies

 only to those patent claims, both currently owned by Google and

 acquired in the future, licensable by Google that are necessarily

 infringed by this implementation of the LibYuv code package. This

 grant does not include claims that would be infringed only as a

 consequence of further modification of this implementation. If you or

 your agent or exclusive licensee institute or order or agree to the

 institution of patent litigation against any entity (including a

 cross-claim or counterclaim in a lawsuit) alleging that this

 implementation of the LibYuv code package or any code incorporated

 within this implementation of the LibYuv code package constitutes

 direct or contributory patent infringement, or inducement of patent

 infringement, then any patent rights granted to you under this License

 for this implementation of the LibYuv code package shall terminate as

 of the date such litigation is filed.