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      1 Additional IP Rights Grant (Patents)
      2 ------------------------------------
      3 
      4 "These implementations" means the copyrightable works that implement the WebM
      5 codecs distributed by Google as part of the WebM Project.
      6 
      7 Google hereby grants to you a perpetual, worldwide, non-exclusive, no-charge,
      8 royalty-free, irrevocable (except as stated in this section) patent license to
      9 make, have made, use, offer to sell, sell, import, transfer, and otherwise
     10 run, modify and propagate the contents of these implementations of WebM, where
     11 such license applies only to those patent claims, both currently owned by
     12 Google and acquired in the future, licensable by Google that are necessarily
     13 infringed by these implementations of WebM. This grant does not include claims
     14 that would be infringed only as a consequence of further modification of these
     15 implementations. If you or your agent or exclusive licensee institute or order
     16 or agree to the institution of patent litigation or any other patent
     17 enforcement activity against any entity (including a cross-claim or
     18 counterclaim in a lawsuit) alleging that any of these implementations of WebM
     19 or any code incorporated within any of these implementations of WebM
     20 constitute direct or contributory patent infringement, or inducement of
     21 patent infringement, then any patent rights granted to you under this License
     22 for these implementations of WebM shall terminate as of the date such
     23 litigation is filed.
     24