diff --git a/_layouts/default.html b/_layouts/default.html
index 1f68038..447c8c9 100644
--- a/_layouts/default.html
+++ b/_layouts/default.html
@@ -40,8 +40,9 @@
 
       <footer class="site-footer">
 	<span class="site-footer">Copyright (C) 2007-2020, <a href="https://dabeaz.com">David Beazley</a></span>
-	<spam class="site-footer">
-<a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/"><img alt="Creative Commons License" style="border-width:0" src="https://i.creativecommons.org/l/by-sa/4.0/88x31.png" /></a><br />This work is licensed under a <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">Creative Commons Attribution-ShareAlike 4.0 International License</a>.</span>
+	<span class="site-footer">
+<a rel="license" href="http://creativecommons.org/licenses/by-nc-sa/4.0/"><img alt="Creative Commons License" style="border-width:0" src="https://i.creativecommons.org/l/by-nc-sa/4.0/88x31.png" /></a><br />This work is licensed under a <a rel="license" href="http://creativecommons.org/licenses/by-nc-sa/4.0/">Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License</a>.
+	</span>
         {% if site.github.is_project_page %}
           <span class="site-footer-owner"><a href="{{ site.github.repository_url }}">{{ site.github.repository_name }}</a> is maintained by <a href="{{ site.github.owner_url }}">{{ site.github.owner_name }}</a>.</span>
         {% endif %}