I'm not an expert on copyright/royalty, but here's my take on it. Just to CMA...you would need to get a copy of the EULA for each product...Curious Labs has a copy on their web site if I'm not mistaken, as does DAZ, who creates many models and products for use in Poser Q1...I think yes...there are characters, and I think they are royalty free, as in you get the license to use them in your stuff...although you surely can't distribute them, sell them, or any of that stuff q2...yes..www.daz.3d and here..plus plenty of other sites sell stuff q3...script ready...Poser 4 with ProPack and Poser 5 support Python scripting..not sure of MASS..also FLASH export.

Humankind has not woven the web of life. We are but one thread within it.
Whatever we do to the web, we do to ourselves. All things are bound together.
All things connect......Chief Seattle, 1854