Add both a vertical side caption and a normal caption to a picture

Question

Is it possible to add a caption to the side of the picture, written vertically in small size (for the credits), while below the picture is the normal caption?

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[EDIT]
Minor issue: why is it that if I write

\documentclass{article}
\usepackage{graphicx}
\usepackage{caption}
\usepackage{copyrightbox}

\begin{document}
\begin{figure}
    \copyrightbox
        {\includegraphics[width=\textwidth]{pic}}
        {(c) Someone}
    \caption{Blah}
\end{figure}
\end{document}

the caption goes further away from the picture, while if I just replace [width=\textwidth]{pic} with [width=.9\textwidth]{pic} it comes out at the usual distance?

Answer 1

The copyrightbox package is done precisely for that:

\documentclass{book}
\usepackage[utf8]{inputenc}
\usepackage[T1]{fontenc}
\usepackage{ebgaramond}
\usepackage{graphicx}
\usepackage[x11names]{xcolor}
\usepackage{caption, copyrightbox}
\captionsetup{justification = centering}

\begin{document}

\begin{figure*}[!h]
  \centering
  \copyrightbox[l]{\includegraphics[scale=0.8]{ernst_vierge}}{Museum Ludwig, Köln}
  \caption{La Vierge corrigeant l’enfant Jésus devant trois témoins\,\\\textit{Max Ernst} (1891--1976)}
\end{figure*}

\end{document} 

Answer 2

One way would be to use a rotatebox inside a figure environment like this:

\documentclass{article}
\usepackage{graphicx}
\begin{document}
\begin{figure}
    \centering
    \rotatebox{90}{\tiny Hans Hillewaert (WIKIPEDIA)}
    \includegraphics[width=0.5\textwidth]{squid.jpg}
    \caption{A Nice Squid}
\end{figure}
\end{document}

this will give something like this :