How to add a license (Creative commons) to a bibtex entry?

Question

I'm writing a paper where I use some data that's available under a creative commons licence (CC-BY). I'm not only citing a finding, but I'm plotting this data, doing analysis with it and thus adapting and sharing it. Obviously, this means that I have to give credit to the source, which is standard practice in academic writing anyways. e.g.

As shown in Fig. 1, comparing our observations with
daily sunshine duration \citep{meteodata2022}, it is
shown that...

with

@Misc{meteodata2022,
  author   = {{Meteo Service}},
  title    = {Meteo Data},
  year     = {2022},
  url      = {https://data.meteoservice.tld/records/sun},
} 

However, creative commons stipulates that I must not only attribute the source, but also give the licence. The website even says that I must "provide a link to the license", which is the point I'm struggling with. Looking at the first official seeming guide I found it appears that it must not neccesarily be a hyperlink, when working with print, so it seems like something like CC-BY or the badge or symbol for the licence ought to be enough.

But how to I add this information to my bibtex entry and how do I make it show up in my references? Is there a standard way for it, or would I need to explain this to the copy editor at the last stage?

Of course I could do something like

As shown in Fig. 1, comparing our observations with
daily sunshine duration \citep[data under Creative 
Commons Attribution licence]{meteodata2022}, it is 
shown that...

But that clutters up the text and thus seems off.

Answer 1

The simplest way would be to use the note field of bibliographic entry. It can hold arbitrary data and it's printed automatically in the standard style.

\documentclass{article}

\usepackage{biblatex}

\begin{filecontents}[overwrite]{biblio.bib}
@Misc{meteodata2022,
    author   = {{Meteo Service}},
    title    = {Meteo Data},
    year     = {2022},
    url      = {https://data.meteoservice.tld/records/sun},
    note     = {This work is licensed under the Creative Commons 
                Attribution 4.0 International License. 
                To view a copy of this license, visit
                \url{http://creativecommons.org/licenses/by/4.0/}.}
}   
\end{filecontents}
\addbibresource{biblio.bib}

\begin{document}
\nocite{meteodata2022}
\printbibliography
\end{document}

If you want to refer to it inside the document (e.g. in a footnote) you can use the \citefield command (\citefield{meteodata2022}{note}).

Note that according to the attributing guide you linked "for offline works it is a good idea to spell out the licence type and any URLs in full." (page 6), so "something like CC-BY or the badge or symbol" is not really enough if you intend to print it.