Part of the description of this license ID says "as long as license for new creations is identical". Does this mean that if I use a plug in with this license identifier in a scene that the license for my created scene has to be CC-BY-SA? Or does this mean only that I can't change the license for this plug-in? In short, can I use a plug-in with the CC-BY-SA in a scene I make and still tag my scene with a PC license when packaging?