Thanks thats helpfull, I'll add a licence tonight (probably BSD)
* Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.See https://www.gnu.org/licenses/gpl-faq.html#ReleaseUnderGPLAnd...
http://www.perlfoundation.org/artistic_license_2_0
It's an interesting balance between freedom and giving back - may be more suited to what you want or may not.