You must purchase 1 license for each art listing (in addition to the art listing) you plan to use for extended production use.
A Make It Production Extended License is required if you intend to produce items for resale in runs of more than 50 pieces at a time, and allows you to print up to 2000 total pieces.
For example, you’ve purchased a clipart pack and used it to create a t-shirt design. If you screen print or Print On Demand these a few at a time (up to 50) to sell, you do not require a Make It Production Extended License.
However, if you are having 100 of your t-shirts printed to sell, you would require a Make It Production Extended License. You can print and sell up to 2000 of your t-shirts. If your shirts sell really well, you can either purchase a second Make It Production Extended License for your next 2000 pieces, or contact me to discuss licensing for unlimited runs.