+1
Licensing and copyright are not straight forward topics. Give BenF time to sort it out. If I were BenF, I would publish the source code under a license so that other people can not distribute closed-source derivatives of it, but are forced to publish their enhanced code. But the one who writes the code is the one to decide! On the other hand it would be good if he would be clear about it if he does not intend to publish the code, so that we can move on.