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In this Chapter—
“certified”, in relation to a section 8(4) certificate, means of a description certified by the certificate as a description of material the examination of which the Secretary of State considers necessary;
“external communication” means a communication sent or received outside the British Islands;
“intercepted material”, in relation to an interception warrant, means the contents of any communications intercepted by an interception to which the warrant relates;
“the interception subject”, in relation to an interception warrant, means the person about whose communications information is sought by the interception to which the warrant relates;
“international mutual assistance agreement” means an international agreement designated for the purposes of section 1(4);
“
”, in relation to a communication intercepted in the course of its transmission by means of a postal service or telecommunication system, means so much of any communications data (within the meaning of Chapter II of this Part) as—is obtained by, or in connection with, the interception; and
relates to the communication or to the sender or recipient, or intended recipient, of the communication;
“section 8(4) certificate” means any certificate issued for the purposes of section 8(4).