\documentclass[11pt,oneside,notitlepage,a4paper,english,parskip=half*] {scrartcl}
\usepackage{luainputenc}
\usepackage[T1]{fontenc}
\usepackage[english]{babel}
\usepackage{color}                
\usepackage{graphicx}
%\usepackage{url}
%\usepackage{hyperref}
\usepackage{floatrow}
\usepackage{booktabs}
\usepackage{tabularx}
\usepackage{csquotes}
% !TeX spellcheck = en_US
\usepackage[
backend=biber
,sortlocale=en_EN%.UTF-8
,style=authoryear
,bibencoding=UTF8 
,block=space
,autocite=inline
]{biblatex}
\begin{filecontents}{\jobname.bib}
@Misc{CreativeCommons4.0,
  author     = {{Creative Commons}},
  title      = {{Attribution-NonCommercial-ShareAlike 4.0}},
  date       = {2013-11-25},
  url        = {https://creativecommons.org/licenses/by-nc-sa/4.0/},
  urldate    = {2019-10-01},
  shorttitle = {{CC BY-NC-SA 4.0}},
}

@book{Payne2019,
  author = {Blakeley Hoffman Payne},
  editor = {{MIT Media Lab Personal Robots Group} and Cynthia Breazeal},
  title = {An Ethics of Artificial Intelligence Curriculum for Middle School Students},
  related = {CreativeCommons4.0},
  relatedtype = {license},
  url = {https://t1p.de/rwlp},
  urldate = {2020-01-27},
  date = {2019-08},
}
\end{filecontents}
\addbibresource{\jobname.bib}
\usepackage[license=short,link=true,url=false,introtext={default}]{biblatex-license}

\let\endtitlepage\relax
\title{\texttt{biblatex-license}}
\author{Anselm Wagner\\a.wagner1@uni-wuppertal.de\\Bergische Universität Wuppertal\\v0.1}

\begin{document}
\maketitle
\begin{abstract}
This package provides a modification to the biblatex standard styles for relating cited works to the license under which they were published. This is done via biblatex' build in \texttt{related} mechanism and \texttt{relatedtype = license}. This package basically provides this new relatedtype, the bibmacros for typesetting these related entries and some additional styling options.
\end{abstract}
\tableofcontents
\vspace{2em}

The package is loaded via
\begin{verbatim}
\usepackage[options]{biblatex-license}
\end{verbatim}
and has to be loaded \emph{after} the \texttt{biblatex} package. The package sets the \texttt{biblatex} option \texttt{related = true}.

\section{Options}

\begin{tabularx}{\linewidth}{c|X|c|c}
\toprule \textbf{Name} & \textbf{Function}  & \textbf{Possible Values} & \textbf{Default} \\
\midrule \texttt{license} & Decides if and how the license is to be printed. & short, full, off & short \\
\hline \texttt{url} & Switch for deciding if the url of the license should be explicitly printed. & true, false & false \\
\hline \texttt{link} & When set to \texttt{true} and \texttt{url} is set to \texttt{off}, the title of the license becomes an \verb|\href|, i.e. a hyperlink. & true, false & true \\
\hline \texttt{introtext} & Makes it possible to replace the language specific intro text (e.g. \enquote{licensed under}) with custom text. & any text & \\\bottomrule
\end{tabularx}


\section{Usage}

Consider the following bibliography:
\begin{verbatim}
@Misc{CreativeCommons4.0,
  author     = {{Creative Commons}},
  title      = {{Attribution-NonCommercial-ShareAlike 4.0 International}},
  date       = {2013-11-25},
  url        = {https://creativecommons.org/licenses/by-nc-sa/4.0/},
  urldate    = {2019-10-01},
  shorttitle = {{CC BY-NC-SA 4.0}},
}

@book{Payne2019,
  author = {Blakeley Hoffman Payne},
  editor = {{MIT Media Lab Personal Robots Group} and Cynthia Breazeal},
  title = {An Ethics of Artificial Intelligence Curriculum for Middle
            School Students},
  related = {CreativeCommons4.0},
  relatedtype = {license},
  url = {https://t1p.de/rwlp},
  urldate = {2020-01-27},
  date = {2019-08},
}
\end{verbatim}
Note, that \texttt{Payne2019} has the fields \texttt{related} and \texttt{relatedtype} defined. \texttt{related} is pointing via the label to the entry corresponding to the license under which \texttt{Payne2019} was published: \texttt{CreativeCommons4.0}. The \texttt{relatedtype = \{license\}} is necessary for \texttt{biblatex} to know how this relation should be handled. Please see the \texttt{biblatex} user guide (§3.4 \emph{Related Entries}) for more information on related entries.

Now if \texttt{biblatex} is loaded with the following options:
\begin{verbatim}
\usepackage[
  backend=biber
 ,sortlocale=en_EN%.UTF-8
 ,style=authoryear
 ,bibencoding=UTF8 
 ,block=space
]{biblatex}
\end{verbatim}

And \texttt{biblatex-license} is loaded the default way:
\begin{verbatim}
\usepackage{biblatex-license}
\end{verbatim}

The bibliopgraphic entry of \texttt{Payne2019} would look like this:
\nocite{Payne2019}\printbibliography[heading=none]

The default way of loading \texttt{biblatex-license} is equivalent to:
\begin{verbatim}
\usepackage[license=short,
            url=false,
            link=true,
            introtext={default}]
            {biblatex-license}
\end{verbatim}

\subsection{\texttt{introtext}}

Note the text \enquote{Licensed under} in the bibliography. This text is, as of now, only translated to german but can be changed via the option \texttt{introtext} like so:
\begin{verbatim}
\usepackage[introtext={Some text}]{biblatex-license}
\end{verbatim}

\subsection{\texttt{link}}

Also note that in the example output above the title of the license is itself a link to where the \texttt{url}-field of the license entry inside the bib-file is pointing. This link is made via \verb|\href|.

\subsection{\texttt{url}}

It might be better to explicitly print the url of the license, which can be done via the \texttt{url=true} option. If printed this way, the option \texttt{link} has no effect on if this url is itself a hyperlink or not aus the url-field is handled by biblatex itself.

\subsection{\texttt{shorttitle} of the license}

If a \texttt{shorttitle} is provided for the license inside the bib-file, the shorttitle will always be preferred. 

\end{document}

