I am going to rig one of the Proton models just for demonstration. Yes, I cannot modify this mesh either sell it. But the mesh is free. Proton is much a Poser guy. I believe he would like it. Please, feel free to come back here on Saturday. Then you can download this free but Poser rigged model.

"I believe he would like it" implies that you don't have his written permission to rig and distribute the model.  I think you'll probably need to obtain that before you give it away.