Howdy pardner!
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-Andrew
G4JC
Hello, Currently it is not possible to play the game without a central server. This is a problem if a user wants to launch a LAN server for a LAN Party since there is no way to authorize users (resulting in chaos if authorization is disabled, but at least making it playable).
A better solution would be to create a Heartbeat Server that is capable of running over LAN. This could be implemented into clients/servers for "LAN Mode" allowing for play even in the event internet access in inaccessible.
The authorization protocol and heartbeat details are described in detail here: https://grahamedgecombe.com/talks/minecraft.pdf
Unfortunately, programing something like this is far above my pay grade. 
