Licence of each dataset; licence of the list about poldata HOT 2 OPEN

Thank you very much for the feedback! I have added a license to the repository and I will add a field to the dataset with the license of each dataset in the future.

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I would suggest you use the Identifier of the SPDX License List, as seen at:
https://spdx.org/licenses/
Most convenient are the machine readable data files for the SPDX License List.
(I am preparing a pull request with R code on this).

Also, in many cases, I expect the data have a written license which is not a standard license (no license name...).
For these at least, having a few fields may help, possibly:

• a short description of the licence
• a string for the type of licence (e.g. "attribution")
• a URL to the licence page/the page where hints on the applicable license were found

This is certainly a huge work to review all datasets! I think keeping the URL of the page where hints on the applicable license were found is very helpful (INCLUDING for dataset licensed under an spdx license): it will help review/update the PolData dataset at a later stage. Also, such list of URLs (in a data.frame) would allow to automatically archive (on archive.org) those pages mentioning the license; this could be of legal use (note that the SPDX list refers to archive.org for 18 cases).

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