Mention the Jupyter trademarks are registered by LF Charities

Author: jasongrout

_layouts/default.html

@@ -176,7 +176,7 @@ <h2>Legal</h2>
         <div class="content content--wide">
           <img src="/assets/logos/rectanglelogo-blacktext-blackbody-blackplanets.svg" width="189" height="51" alt="Project Jupyter logo">
           <p>
-              The Jupyter Trademark is registered with the U.S. Patent & Trademark Office. © {{site.time | date: '%Y' }}
+              The Jupyter® and Jupyter Logo® trademarks are registered with the U.S. Patent & Trademark Office by <a href="https://lf-charities.org/">LF Charities</a>. © {{site.time | date: '%Y' }}
           </p>
         </div>
       </section>