Creators of items may release their items to the public. The intent is so other creators can create their own items using this source. When you list your items you must give credit to the original creators, or attribute them.
To assign a basis item when you are listing in the shop use the attribution section and select an item from your favourites. If someone uploads an item that should be attributed but is not, the item should be Reported so that it can be Deleted.
The source creator gets 50 percent of the base price (same as the original item) and the derivative creator gets 30 percent of the remaining cost.