Dear List,

   I am building a R package which collects ecological data about plant
species from both remote (web) databases and locally stored rda files
(datasets): these "local rda files" are derived from publicly available
databases for which no "official" licenses are provided; I was told by the
creators of these databases that users can use such data provided that the
correct bibliographic reference is always used (the package is already
reminding the users about the correct citation(s) to use). I thought a
CC-by licence would suit this need, thus I am posting here to ask if:

     1) It is possible to distribute these datasets as rda files within my
package (which will be released as GPL=>2, thus two different licences will
be needed for the package)
     2) If a CC-by licence for these datasets could be included in the
DESCRIPTION file, using something like "License: CC-by datasets.rda" for
each rda file (this is based on this stackoverflow thread
<http://stackoverflow.com/a/4317300>, but CC-by is not among the LICENSES
cited in http://www.r-project.org/Licenses/): I've already tried to do
this, but, as a consequence, the "R check" raises a warning.

   I am aware that this is more a licensing issue then a programming
problem, but I went through the R FAQ, "Writing R Extensions" and R-devel
but was not able to sort this problem out (so, please ignore this post if
you find it OT).
   I hope the question is not too messy (this is my first time on R-devel).
   Many thanks for any help you may provide,


Gionata Bocci.

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