Some of the characters for sale are based upon DAZ characters or the standard P4 and P5 characters. They will be encoded so that you must have the original character installed on your computer to use the new one. The "notes" section is specifically to alert potential buyers about ALL prior required purchases... but most vendors are very upfront, for example: "you must have Vicky 2" in the product description. Some of the characters sold are original meshes, not related at all to the standard ones. Natalia and Natrixa by DaCort, all those glamorous Supermodels by Jim Burton, Koshini by Littlefox, Dina by DSI, Ossian (but I can't remember the artist... sorry) are all brand new meshes. If creating a texture or adaptation for a model made by someone else, you ought to contact that person first before public release. Simple courtesy. Carolly