Should `pdfcopyright` be treated as a comma separated list?

[rzach]

I don't know but I think pdfcopyright and dc:rights should just be free form text. But l3pdfmetadata processes it as a list. E.g.,

\DocumentMetadata
  {
    lang=en-US,
    pdfversion=2.0,
    pdfstandard=ua-2,
    debug={xmp-export}
  }

\documentclass{article}
\usepackage{hyperref}
\title{%
On a heuristic viewpoint concerning the production and
transformation of light}
\author{Albert Einstein}
\date{March 17, 1905}
\hypersetup{%
pdfcopyright={Copyright (C) 1905, Albert Einstein}
}

\begin{document}
\maketitle
\end{document}

produces

<dc:rights>
    <rdf:Alt>
     <rdf:li xml:lang="x-default">Copyright (C) 1905</rdf:li>
     <rdf:li xml:lang="en-US">Copyright (C) 1905</rdf:li>
     <rdf:li xml:lang="x-default">Albert Einstein</rdf:li>
     <rdf:li xml:lang="en-US">Albert Einstein</rdf:li>
    </rdf:Alt>
   </dc:rights>

[u-fischer]

Looks wrong, I will check it.

[u-fischer]

pdfcopyright is one of the keys that support language alternatives, and so it interprets its value as a comma list.

You will have to protect a real comma with additional braces:

\DocumentMetadata
  {
    lang=en-US,
    debug={xmp-export}
  }

\documentclass{article}
\usepackage{hyperref}

\title{%
On a heuristic viewpoint concerning the production and
transformation of light}
\author{Albert Einstein}
\date{March 17, 1905}
\hypersetup{%
pdfcopyright={{Copyright (C) 1905, Albert Einstein}, [fr]{Tous droits réservés.}}}


\begin{document}
\maketitle
\end{document}

gives

   <dc:rights>
    <rdf:Alt>
     <rdf:li xml:lang="x-default">Copyright (C) 1905, Albert Einstein</rdf:li>
     <rdf:li xml:lang="en-US">Copyright (C) 1905, Albert Einstein</rdf:li>
     <rdf:li xml:lang="fr">Tous droits réservés.</rdf:li>
    </rdf:Alt>
   </dc:rights>