Censorship.
From a 1915 government report.

"The object aimed at by the Government in its control of war news ought to be to facilitate the supply of information to the press quite as much as to prevent the publication of injurious matter. More is done by way of supplying news than is realised by some critics or admitted by others."

"There is no compulsory submission by newspapers of any class of matter for censorship. A newspaper commits no offence if it never submits anything to the censors at all. The offence consists in publishing something which can be proved in a criminal trial to offend against the Defence of the Realm Acts."
http://www.nationalarchives.gov.uk/education/britain1906to1918/pdf/complete_g6.pdf