Add patent retaliation clause question to FAQ

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         preserved, not doing so could make it harder to later track
         down who might have a copyright interest in a given
         work.</p>
+        <p>Q: Does the WPDD have a patent retaliation clause?<br>
+        A: No. In essence these say that, if a licensee sues the 
+        licensor for patent infringement then any patent license that 
+        the licensee received will terminate. The WPDD doesn't 
+        include this for two reasons:</p>
+        <ul><li>You need to have have patents for such a clause to
+        work, and those are given up as part of the WPDD.</li>
+        <li>It runs contrary to the Statement of Purpose.</li></ul>
         <p>Q: Why doesn't the Worldwide Public Domain Dedication
         (WPDD) include trademarks?<br>
         A: The WPDD doesn't include trademarks because that's a