Originally Posted by _skip
If it's not a unique key, chances are it won't work with multiplayer because they generally ban those "well-known" keys and check for duplicates that are on at the same time.
The big reason they use cd-keys is to reduce load on their servers (for multiplayer), so that they don't have 10,000 or more people (that shouldn't be there) using up bandwidth and resources when they never bought the game and therefore never had a unique key. They can't really stop people from sharing their keys (and cracking games) in order to play singleplayer...but they can usually keep people from multiplayer. I think that answered your question....
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