Once you purchase a premium product, you have the right to utilize it in your projects. However, if you need clipart for a commercial project, pay attention to the license your project comes with. For commercial projects you need a commercial license, so make sure you’re getting this very type of license with your product. Pretty often a product with commercial license costs a little bit more than the one with the personal one, but in many cases, it’s pointless to purchase a personal license.