Data is considered discoverable facts and therefore not protected by copyright; however, the display of data, such as within a table or figure, is copyrightable
Data cannot be copyrighted but it can be owned and licensed using Creative Commons
Each citation style will provide guidance on how to cite a data set.
Data Sharing Best Practices
Licensing data makes it available but on the terms of the researcher (i.e. what others can and cannot do with the data)