Thank you for this great catalog!
It would help a lot to have a field for the licence of each dataset, using one of the normalised licence codes.
This would complement these very helpful fields :

• availability = Availability of dataset
• registration = Requirements for data access
• free= Free access to data (1 = Yes, 0 = No)

In addition, you may want to specify an open data licence for the list itself (not the R package). (If one is already specified, I failed to see it on the Readme).