\vfill
\vfill
\footnotesize
-\cc\byncsa\\
-This presentation is licensed under CC-BY-NC-SA-3.0\\
-and builds on icons from the Tango Desktop Project
+\cc\bysa\\
+This presentation is licensed under the terms of the \\
+Creative Commons Attribution-ShareAlike 3.0 Unported license\\
+and builds on public domain icons from the Tango Desktop Project
\end{center}
\end{frame}