Online playable strategic multiplayer games

[Proten2403]

My question is what strategic games are playable online without an CD/DVD and the correct serial number? (Like Call of Duty 2 but strategic!)

[GLH]

What is the problem with the need of a correct serial number.
If you want to play a game, then you have to buy it. If you buy it, you'll have a correct serial number.

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