Additional IP Rights Grant (Patents)
------------------------------------

"These implementations" means the copyrightable works that implement the WebM
codecs distributed by Google as part of the WebM 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 these implementations of WebM, 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
these implementations of WebM. This grant does not include claims that would
be infringed only as a consequence of further modification of these
implementations.

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 any of these implementations of WebM or any code incorporated
within any of these implementations of WebM constitute direct or contributory
patent infringement, or inducement of patent infringement, then any patent
rights granted to you under this License for these implementations of WebM
shall terminate as of the date such litigation is filed.
