It is the code needed to play the game.
You must own the game and your own copy of the key to play.
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The CD Key will be on the back of the CD case you purchased.
The CD key for Diablo 2 was printed on the original CD case for the game. If one has misplaced the original case, there are several sites online where people may list codes for free.
It is usually on the paper to your left inside the jewel case.
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.