[R] Licensing data sets

[Christian Lederer]

Hi,

i am working on a biosignal package which has a data set package
as dependency (e.g. for the examples).
This data set package will include patient data.
Of course, the patients will be asked for their informed
consent, and the data will be anonymized.

I am not sure about the appropriate license for the
data set package.

On the CRAN, there are many packages containing data sets
which are under GPL.
However, the GPL seems not appropriate for me, since it is
only about software, not about data.
Furthermore, i have to inform the patients about the license
in order to obtain their consent, and the GPL seems too
complicated for this purpose.

Has anybody an idea which license to use?

Christian