Licenses are used to define what users can do with the provided data
A license can be assigned to a package and all data in the package
We use creative commons licenses
Details can be found on creative commons website
In general can be set to completely free (everyone can use or modify the data in any possible way), share alike (everyone can use and modify the data but has to release the data openly), non comercial (only non commercial use allowed), no derivation (data can be used but not changed), and combinations of this
It is also possible to not choose any license, then a statement will be printed stating for license information, the package owner should be contacted
Packages contain a license note stating that additional rights can be granted, for more information the package owner can be contacted

Creative commons license

Attribution-NoDerivs CC BY-ND

This license allows for redistribution, commercial and non-commercial, as long as it is passed along unchanged and in whole, with credit to you.

Allow adaptations of your work to be shared