Boring but bound by routine 🙂
For example: You can’t buy and convert it to a ecommerce extension and sell or give it to more than one client. You can’t license an item and then make it available as-is on your website for your users to download.
Examples of “on demand”, “made to order” or “build it yourself” applications: Plugin, extension, addon. You will need one license for each product created by a customer.