\usepackage[filehooks]{svn-multi}
\usepackage{xcolor}
\newcommand\addRevisionData{%
  \begin{picture}(0,0)%
    \put(0,-10){%
      \tiny%
      \expandafter\@ifmtarg\expandafter{\svnfiledate}{}{%
        \textcolor{darkgray}{Kapitlet er sidst opdateret \svnfileyear/\svnfilemonth/\svnfileday
         \enspace \svnfilehour:\svnfileminute\ (revision \svnfilerev)}
     }%
    }%
  \end{picture}%
}
\makeoddfoot{plain}{\addRevisionData}{\thepage}{}
\makeevenfoot{plain}{\addRevisionData}{\thepage}{}