CD Key Non-interoperability
Blizzard games are packaged with unique codes. CD keys are entered, but not verified, during the installation process. Connection to battle.net is permitted only with a valid and unique key. Individual keys are regularly disabled by battle.net administrators to block suspected cheaters from battle.net. Players with invalid or disabled keys remain able to play independently of battle.net, such as in single-player mode, or through a direct connection to another player.
Blizzard, citing security and piracy concerns on their webpage about emulation, does not allow battle.net to interoperate with bnetd servers to verify CD keys. Because of this, bnetd servers do not implement battle.net's validation. This allows players to access full multiplayer functionality of Battle.net capable games without a valid CD key, by connecting to a bnetd server.
Read more about this topic: Bnetd
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