PATENTS

Additional IP Rights Grant (Patents)

"This implementation" means the copyrightable works distributed by
Google as part of the Shac 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 this implementation of Shac, 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. 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 or any other
patent enforcement activity against any entity (including a
cross-claim or counterclaim in a lawsuit) alleging that this
implementation of Shac 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
Shac shall terminate as of the date such litigation is filed.