What is the data policy to use the Climate Data Store (CDS) datasets?

I would like to use CDS datasets; what licences apply to these data?

Copernicus data are provided free of charge to users. However, each dataset comes with a license which needs to be validated by the user (once) before any data can be downloaded. If a dataset has been funded by the Copernicus Climate Change Service (C3S), the dataset is provided under the Copernicus license, otherwise it will be made available under the originating centre license.