38 CENTRUM FÖR RÄTTVISA v. SWEDEN JUDGMENT 124. Consequently, the Court finds that the law indicates the scope of mandating and performing signals intelligence conferred on the competent authorities and the manner of its exercise with sufficient clarity. (iii) Duration of secret surveillance measures (α) The parties’ submissions 125. The applicant submitted that the legislation satisfied the minimum requirements in terms of duration of the permit. 126. The Government held that the Signals Intelligence Act clearly regulated the maximum duration of a permit and the conditions under which a permit could be renewed. (β) The Court’s assessment 127. The Court has held that it is not unreasonable to leave the overall duration of interception to the discretion of the relevant domestic authorities which have competence to issue and renew interception warrants, provided that adequate safeguards exist, such as a clear indication in the domestic law of the period after which an interception warrant will expire, the conditions under which a warrant can be renewed and the circumstances in which it must be cancelled (see Roman Zakharov, cited above, § 250). 128. As regards the first two safeguards, the Signals Intelligence Act stipulates that a permit may be granted for a maximum of six months and that it may be extended, following a new examination, for six months at a time (see paragraph 23 above). The examination preceding a renewal must be understood as encompassing a full review by the Foreign Intelligence Court as to whether the conditions set out in section 5 of the Act are still met (paragraph 19). The Act thus gives clear indications of the period after which the permit will expire and of the conditions under which it can be renewed. 129. In respect of the third safeguard, the circumstances in which interception must be discontinued, the legislation is not equally clear. There is no provision obliging the FRA, the authorities mandated to issue detailed tasking directives or the Foreign Intelligence Court to cancel a signals intelligence mission if the conditions for it have ceased to exist or the measures themselves are no longer necessary (cf. Klass and Others, cited above, § 52; and Kennedy, cited above, § 161). 130. Nevertheless, notwithstanding that the relevant legislation is less clear with regard to the third safeguard, it must be borne in mind that any permit is valid for a maximum of six months and that a renewal requires a review as to whether the conditions are still met. Furthermore, although the Foreign Intelligence Inspectorate is not tasked with inspecting every signals intelligence permit, it may decide that an intelligence interception shall cease, if during an inspection it is evident that the interception is not in