In the past, a "key" referred to a 24-digit numeric code used to perpetually license software (e.g., Illustrator CS6). However, Adobe has transitioned almost entirely to a subscription model known as .
A: If you didn't buy from Adobe or a major retailer (Target, Staples, etc.), you likely bought a pirated or stolen key. Adobe’s systems detect these immediately. You must request a refund from the seller (though you likely won't get one).