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A copy of their source code is supposedly on file with the Library of Congress, but I can't find proof of this as I search right now.

• astrange 10y ago
  This is the usual practice for registering copyrights, but I don't think you need to send the whole source.
  • vessenes 10y ago
    The first 25 pages of dwarf fortress code is probably really interesting actually; VIOLENCE_COEFFICIENT = 2.4 CIVILIZATION_HEGEMONIZATION_TENDENCY = 1.8232