Cola by citric or other isolated acids. Coca-Cola's recipe is maintained as a corporate trade secret. A variety of different sweeteners may be added to cola, often partly dependent on local agricultural policy. High-fructose corn syrup (HFCS) is predominantly used in the United States and Canada due to the lower cost of government-subsidized corn. In Europe, however, HFCS is subject to production quotas designed to encourage the production of sugar; sugar is thus typically used to sweeten sodas. In addition, stevia or an artificial sweetener may be used; "sugar-free" or "diet" colas typically contain artificial sweeteners only. In the 1940s, Coca-Cola
Coca-Cola in 1982, and began inserting Coke-product images into many of its films. After a few early successes during Coca-Cola's ownership, Columbia began to under-perform, and the studio was sold to Sony in 1989. Coca-Cola has gone through a number of different advertising slogans in its long history, including "The pause that refreshes", "I'd like to buy the world a Coke", and "Coke is it". In 2006, Coca-Cola introduced My Coke Rewards, a customer loyalty campaign where consumers earn points by entering codes from specially marked packages of Coca-Cola products into a website. These points can be redeemed for various prizes