What is Ex Officio Information?

Legal Definition
In English law. A criminal information filed by the attorney general ex officio on behalf of the crown, in the court of king's bench, for offenses more immediately affecting the government, and to be distinguished from informations in which the crown is the nominal prosecutor. Mozley & Whitley; 4 Steph. Comm. 372-378.
-- Black's Law Dictionary
Legal Definition
Criminal informations filed by the attorney general in England.
-- Ballentine's Law Dictionary