People who Pirate Paradox games really should not come to the official site and expect tech support.
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Technically you need one CD per user, but I cannot tell you no one will be breaking down your door to arrest you, but no one will be breaking down your door to arrest you. 
If you are both playing online at the same time you should prob. have two copies.Mr. G said:And I can't tell you that I had not thought to buy more than one DD game
But dose I need to buy more than one game if two persons would like to play online at the same time?