The basic thing is that an extended license will allow you to use the asset in a game engine (in general terms read the license for exact terms). If all you are doing is making pictures out of the assets with your own computers then you can use the regular license. So you can take a figure chop off the head and use that head on another figure for anything you do yourself. However you can not give/sell/transfer it someone else. So if you use Poser/DAZ to work with a figure and then transfer it to Vue and make a picture out of it then all is good. And most of the time you can then take that picture and sell it, as long as it does not contain copyrighted images/logos.

Poser 5, 6, 7, 8, Poser Pro 9 (2012), 10 (2014), 11, 12, 13, 14