As to the License, there basically isn't any.  :-)

The original code for RDCF2 was released under Public Domain by the
original author.  I've tacked on an MMC/SD driver to it, cleaned up
the sources so that it will build under a gcc compiler, added
funtionality and re-released under the Public Domain.

All that I ask is that you give credit to me and the original author.
You can do this by retaining the copyright notices in the rdcf2.c, 
rdcf2.h, and the software associated with the mmc driver module.

Tom Walsh - openhardware.net
Nov 17, 2005