in England, Wales and Northern Ireland, a law that gives people the right to ask a public authority or organization whether they have any information on a particular subject, and if so, to obtain it. The authority or organization must reply to a request within 20 working days but may refuse to provide information in some circumstances, for example where it could harm national security. The law also requires public institutions to follow a programme of publishing the information that they hold. It was passed in 2000 but only came fully into effect in 2005. A separate but similar law applies in Scotland.
قانون آزادی اطلاعات
compare Official Secrets Act