This software is covered by a license that does not fit into any of the other categories and has a restriction that prevents TeX distributions from holding it. Thus the software is not free according to the Debian Free Software Guidelines.
Note that you grant license to anyone to download your package, by uploading it to CTAN. The “nonfree” part of the name reflects the distinction of this category of license: the software may (typically) not be further distributed.
Please check the software's license before using the software.