Unless you enjoy a stone and steel cell on an island, you don't.
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You must have the CD Key to play most computer games, the code should be located on the back of you manual, if you have the DVD version. If you have the download version, then your on your own...
if you have lost your CD key then you can dowload something called a keygen as it will find the key code for that game aslong as you the keygen for the game you need the CD key for.
apps.com gamestop.com and itunes.com
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.