Part 2: Lawful interception of communications Chapter 3: Other provisions about interception Section 58: Section 57: meaning of "excepted disclosure"
This section provides that in certain situations the duty not to make an unauthorised disclosure in section 57 does not apply. Disclosures made in such circumstances are called "excepted disclosures". Excepted disclosures are grouped into 4 heads.
	Head 1 includes disclosure authorised by the warrant. It also includes disclosure which is necessary for the purpose of providing assistance in giving effect to a warrant (for example, where a company may not own the relevant part of the network to undertake the interception and requires the assistance of another company to give effect to the warrant). Head 2 allows disclosure made to or authorised by a Judicial Commissioner, or a disclosure to the Independent Police Complaints Commission or the Intelligence and Security Committee of Parliament. Head 3 allows disclosures made by a professional legal adviser in connection with legal proceedings, or a disclosure between a client and professional legal adviser in connection with advice about Part 2 of the Act or relevant provisions of RIPA. Head 4 allows the disclosure of statistical information by a postal operator or telecommunications operator, subject to any requirements imposed by regulations made by the Secretary of State, and for the disclosure of information by any person about warrants in general. This does not provide for disclosure of any particular warrant issued under Chapter 1.