Secondlife sculpties are primitives that export as a small TGA bitmap that can be used to create small building blocks in the program. There's no worry about V4 or anything of any complexity being exported to Secondlife.  Hex can make sculpties. There's nothing listed in the DS features, at DAZ, to indicate that it can export to SL, but I don't know if it's a capability that wouldn't be listed on the website.

SL is a low poly environment with figures on par with Poser 2 figures. You can download those figures and their templates from SL. I looked up the max texture size for the program and was surprised that it could be as large as 1024x1024. I thought it was much smaller.

Considering that you're dealing with a "profissional", who has many satisfied "costumers", it's not likely that this person has the skill to transfer a Poser figure texture to an SL figure. It's more likely he's selling artwork in SL.

About the only thing that can be readily exported from Poser to SL are BVH motions. Models cannot be imported into SL. Although textures could be stolen, it would take a fair amount of work to do it because mapping is different. The problem isn't as big as it seems. The primary amount of theft in SL is from other SL merchants because it's the easiest stuff to steal that is compatible in that world.

My visual indexes of Poser content are at http://www.sharecg.com/pf/rgagnon