i think CD key provide an access to do some thing. it is often used in playing game like wow CD key and ffxi CD key.
The "key" is usually placed on the original CD sleeve or sent separately as in an email or other media. The CD key will not be imbedded anywhere on the CD.
You get a CD key free when you buy the CD for Reign of Chaos
When you purchase you game, you CD key should be inside. Do not ask for other's CD keys.
The CD key is on the packaging of the game that you bought.
The CD Key will be on the back of the CD case you purchased.
You may be able to download the software and use the key
hau to get cd key
prince of Persia CD key
you use the CD key of your ordinary halo game
brain lara cricket 2007 cd key