% public domain. no rights reserved. see
% https://creativecommons.org/publicdomain/zero/1.0/

% any law which is an invention of mankind is impeachable.
\begin{frame}[fragile]

  {\tiny
  \begin{semiverbatim}
    Slides under public domain. No rights reserved. See
    https://creativecommons.org/publicdomain/zero/1.0/ for full
    legal verbiage.

    Source at https://git.ricketyspace.net/combox-paper/tree/presentation
  \end{semiverbatim}
  }
\end{frame}