Quoting myself from page 2 of the thread:

Quote - As I told Paul in PM, you all can feel free to use this in products. It is a free merchant resource. Make whatever money you can from it. Just don't sell it by itself as a shader - it has to be in a product with a mesh. And you have to say you got it from me in your readme.txt.

So you have the right to use it in a commercial product.

As for the notion of MM nodes, you misunderstand. There is no such thing. There is no way to add custom nodes to Poser. Matmatic is just a way to make standard Poser nodes more easily (for me at least). But the resulting materials are standard Poser materials. They are better than what other people make by hand, but they could have been made by hand.

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Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)