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