Quote - they can only build on the existing framework, as they run the risk of a derivative work, unless one can produce a demo that belies that.

Seriously?  I've never seen these discussions.  Poser can't be rewritten from scratch because, what?  It might end up being derivative of Daz Studio? 

Intellectual property stuff is just put together sideways. 

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Cage can be an opinionated jerk who posts without thinking.  He apologizes for this.  He's honestly not trying to be a turkeyhead.

Cage had some freebies, compatible with Poser 11 and below.  His Python scripts were saved at archive.org, along with the rest of the Morphography site, where they were hosted.