CC license

I'm LaTeXing my class notes, and I plan on distributing them in some sense. Here's the Creative Commons license in LaTeX that I came up with (which puts CC in a circle and uses the hyperref package to hyperlink it):

\newcommand{\cclicense}{%
  \smash{\raisebox{-0.45ex}{%
  \setlength{\unitlength}{1em}%
  \begin{picture}(1,1)%
    \put(0.5,0.5){\circle{1}}
    \put(0.5,0.5){\hbox to 0pt{%
      \hss\raisebox{-.45ex}{\tiny\textsf{CC}}\hss}}%
  \end{picture}%
  }}%
  \hskip -1em%
  \href{http://creativecommons.org/licenses/by-sa/3.0/}%
  {\ \hskip 1em \textsf{BY-SA}}%
}

Update: thanks are due to Mike for pointing out my use of an externally defined term, which I thought was in base/latex.ltx but was actually defined elsewhere.