From dev newsletter #50:-
What is Frontier's plan for when the servers shut down?
We do not plan to shut the servers down, but understand it is a reasonable question. We are at the beginning of the game not the end and are focused on creating a game that we hope will be played for many years in the future. We do plan to take regular archives of the game and the servers, to preserve the game for the future.
Could the server code be released publicly some day when the servers are shut down?
Yes. This is something we would do if for whatever reason we cannot keep the game going.
Soooo, not posted to the wider web, but very much on record.