You probably want to check with them to be sure, but if I'm following the PoserWorks license agreement correctly, a set of UV maps generated from the source files and renders of the object without textures should constitute derivative works under item number 4.

It should be allowed, therefore, to generate the UV maps (with UV Mapper or a modeling program, say) and reference images to supply to a third party for the purpose of generating new materials.

I'm not a lawyer, but I did play one on stage once.