We define such sold media as owned media whose traffic is so strong that other organizations place their content or e-commerce engines within that environment.
Print media has been kind to J.K. Rowling. The Potter novels have sold more than 450 million copies through Bloomsbury in Britain and Scholastic in the USA.
Anything older than the 'sell by' date makes us think it's old and the food has gone off, but in fact this is just the date supermarket wants to sell it by.