A "Rise of Nations: Thrones and Patriots" product key is the alphanumeric serial number that comes with each copy of the game. It is usually located by the registration instructions or on a sticker at the back of the jewel case.
The product key, also known as the activation key or serial number, is required to play the game and unlock online and special game features, such as updates and game patches. "Rise of Nations: Thrones and Patriots" is the official expansion pack of the real-time strategy video game series "Rise of Nations." The series was developed by Big Huge Games and published by Microsoft Game Studios. The game is available for Microsoft Windows and Mac OS X.