The Premium license is for re-sell and gives you license to create physical products like posters, calendars, t-shirts and practically anything you can imagine. It also covers all the other licenses.
The Commercial license covers any use where you gain profit, like ads, webshops and company websites.
The Editorial license is for non-profit organisations, newspapers and magasines to be used in the body of the articles or texts, accompanying and/or illustrating them.
The Personal license is for private blogs, websites and social media where no profit is gained.