- The recent criminal trials of Erol Incedal on terrorism-related charges, in which central details were kept secret from the public, suggests a lack of clarity about information control in a contemporary context - It is legitimate to restrict information in the interest of national security, but only where this is strictly necessary and when safeguards exist to maintain open justice and freedom of expression - The British experience of security censorship during the Second World War provides a compelling case study of information control in an otherwise open society that should be used to inform future policy - The self-regulated system adopted during the Second World War ensured considerable press freedom, but was hindered by a lack of planning and poor co-ordination between the press and competing authorities - The Second World War case study suggests that information control procedures will always be contentious but that they can be made more successful through careful planning and co-ordination, the involvement of a broad range of representatives, and an awareness of the public interest in imparting and receiving information - Both the historic and contemporary case studies indicate that information control in an open society will rely upon a degree of self-regulation and require clear guidelines, co-operation, and opportunities for dialogue.