[R-sig-Fedora] License of the nutshell package

[Pai]

Hello,

I wish to package the nutshell package. I need help to understand which
license is relevant.

The upstream page at
http://cran.r-project.org/web/packages/nutshell/index.html says
that the license is "file LICENSE". 

This is further explained at
http://cran.r-project.org/web/packages/nutshell/LICENSE as

[snip]

The audioscrobbler data is made avaialable under the following Creative Commons license:

	http://creativecommons.org/licenses/by-nc-sa/1.0/

All other data files are made available under a Creative Commons Attribution 3.0 United States License:

	http://creativecommons.org/licenses/by/3.0/us

[/snip]

So, which version of the creative commons license is appropriate ?

Thanks and regards,
-- Pai