You are granted a One Time Usage License in case of purchasing a product at a Non-Unique Price. It enables you to use each individual product on a single website only, belonging to either you or your client. You have to purchase the same template or extension again if you to use the same design in connection with another or other projects.
A commercial license is for your one commercial website or project – meaning you cannot resell or redistribute digital files as they are. You have to purchase "Extended License" if you want to use the same product in other commercial projects.
This license entitles you to integrate the template or extension with the software, freeware, or application. You are permitted to redistribute or resell your created products unlimited number of times.