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Google Patent License for WebM
Google Patent License for WebM
Patent License
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.