This research studies the historical and political move from secrecy to transparency in international negotiation, and investigates to what extent the latter constitutes a political progress. Exploring century-old texts on diplomatic practice, Chapter 1 shows how secrecy was constructed as the norm of international negotiations (from the Renaissance to the apex of absolute monarchy): both the negotiation process and outcome could be veiled. Secrecy has then been contested by the principle of publicity, the philosophical roots of which are examined (from the Enlightenment to Wilson): negotiation process could remain secret, but it became generally agreed that its outcome should be made public (Chapter 2). Chapter 3 introduces the concept of ...