To get a "Need for Speed Underground 2" CD key, players are required to purchase the game. The CD key is located on the packaging that came with the CD so that when the disc is inserted, the game can be downloaded and activated for play. Lost product key codes may be retrievable by contacting the manufacturer, EA Games.
A CD key is also known as a product key. The key is an alphanumeric code that is unique to each purchased copy of "Need for Speed Underground 2." Assigning unique product keys allows the manufacturer to ensure that the software being used was legally purchased.