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+Additional IP Rights Grant (Patents)
+
+"This implementation" means the copyrightable works distributed by
+Google as part of the WebRTC project.
+
+Google hereby grants to you a perpetual, worldwide, non-exclusive,
+no-charge, 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 the VoiceEngine Framework and the VideoEngine
+Framework included in the WebRTC package, 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 of the VoiceEngine Framework and the
+VideoEngine Framework included in the WebRTC package. 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 against any entity (including a cross-claim or
+counterclaim in a lawsuit) alleging that this implementation of the
+VoiceEngine Framework and the VideoEngine Framework included in the
+WebRTC package or any code incorporated within this implementation of
+the media components included in the WebRTC package 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 the VoiceEngine Framework and the
+VideoEngine Framework included in the WebRTC package shall terminate
+as of the date such litigation is filed.