Roel Janssen <roel@gnu.org> writes:

> Dear Guix,
>
> I'd like to add the CC-BY-ND licenses, but I am not sure whether these
> are free.  So, what do you think?

From the license text:

NoDerivatives — If you remix, transform, or build upon the material, you
may not distribute the modified material.

I believe this makes CC-BY-ND non-free, since you are not allowed to
share modified works.