Background-image on titlepage at upper right corner

Piece of cake with tikz

\documentclass{article}

\usepackage[utf8]{inputenc}
\usepackage[T1]{fontenc}
\usepackage[ngerman]{babel}

\title{Test}
\author{Test}
\date{\today}

\usepackage{tikz}    
\begin{document}
\maketitle
\begin{tikzpicture}[remember picture,overlay]
   \node[anchor=north east,inner sep=0pt] at (current page.north east)
              {\includegraphics[scale=0.2]{example-image-a}};
\end{tikzpicture}

\end{document}

\documentclass{article}
\usepackage[utf8]{inputenc}
\usepackage[T1]{fontenc}
\usepackage[ngerman]{babel}

\title{Test}
\author{Test}
\date{\today}
\usepackage{eso-pic}
\usepackage[demo]{graphicx}
\newcommand\AtPageUpperRight[1]{\AtPageUpperLeft{%
   \makebox[\paperwidth][r]{#1}}}
\begin{document}

\AddToShipoutPictureBG*{%
  \AtPageUpperRight{\raisebox{-\height}{\frame{\includegraphics[width=8cm]{Uni-Logo}}}}}
\maketitle

\end{document}