Article 7 (Communication-Restricting Measures for National Security) (1) Only when the national security is expected to be put in grave danger or it is necessary for counterterrorism activities defined in subparagraph 6 of Article 2 of the Act on Counter-Terrorism for the Protection of Citizens and Public Security, if the collection of intelligence is required to prevent such danger, the heads of the intelligence and investigative agencies prescribed by Presidential Decree (hereinafter referred to as "heads of intelligence and investigative agencies") may take communicationrestricting measures as follows: <Amended on Dec. 29, 2001; Mar. 3, 2016; Mar. 24, 2020> 1. If either or both of the parties concerned with a communication are Korean nationals, permission therefor from a chief presiding judge of the high court shall be obtained: Provided, That the same shall not apply to the military telecommunications (limited to where the telecommunications are used to conduct operations) provided for in Article 2 of the Military Telecommunications Act; 2. Written approval shall be obtained from the President with respect to communications of countries hostile to the Republic of Korea, foreign agencies or groups and foreign nationals suspected of engaging in antinational activities, or members of groups within the Korean Peninsula effectively beyond the sovereignty of the Republic of Korea and their umbrella groups based in foreign countries, and in the event of the proviso of paragraph (1) 1. (2) The effective period of communication-restricting measures under paragraph (1) shall not exceed four months, and in the event that the objective of such communication-restricting measures is attained, the communication-restricting measures shall be immediately discontinued; but if the requirements prescribed in paragraph (1) continue to be in existence, the effective period of the communication-restricting measures may be extended up to four months with permission therefor from a chief presiding judge of the high court or approval therefor from the President after filing an application for such permission or approval, accompanied by the material establishing a prima facie case: Provided, That the communicationrestricting measures provided for in the proviso of paragraph (1) 1 may be extended without approval therefor from the President until military operations are completed in the event that the nation is in time of war or incident, or at war with an enemy in the national emergency corresponding thereto. <Amended on Dec. 29, 2001; Mar. 24, 2020> (3) Article 6 (2), (4) through (6), and (9) shall apply mutatis mutandis to the permission under paragraph 1 (1). In such cases, "judicial police officer (including military police officer; hereinafter the same shall apply)" shall be deemed “heads of intelligence and investigative agencies”; "court", " chief presiding judge of the high court"; "Article 5 (1)", "main clause of Article 7 (1) 1"; and "communication-restricting measures for each criminal suspect or person subject to internal investigation" in Article 6 (2) and (5), "communication-restricting measures", respectively. <Amended on Dec. 31, 2019; Mar. 24, 2020> (4) Necessary matters such as procedures for a presidential approval referred to in paragraph (1) 2 shall be determined by Presidential Decree.