5. User identification word (referring to the identification codes of users used to identify the rightful users of computer systems or communications networks); 6. Dates on which users subscribe or terminate their subscriptions. (Emphasis added.) Related Provisions Former Telecommunications Business Act (wholly revised by Act No. 10166 on March 22, 2010, and before amended by Act No. 17347 on June 9, 2020) Article 83 (Protection of Confidentiality of Communications) (4) The request for provision of communications data under Section (3) shall be made in writing (hereinafter referred to as “Written Request for Provision of Data”), which states a reason for such request, relation with the relevant user and the scope of necessary data: Provided, That where it is impossible to make a request in writing due to an urgent reason, such request may be made without resorting to writing, and when such reason disappears, a Written Request for Provision of Data shall be promptly filed with the telecommunications business operator. Telecommunications Business Act (wholly revised by Act No. 10166 on March 22, 2010) Article 83 (Protection of Confidentiality of Communications) (5) Where a telecommunications business operator provides communications data according to procedures under Sections (3) and (4), he or she shall retain the ledgers prescribed by Presidential Decree, which contain necessary matters, such as records indicating that communications data are provided, and the related materials, such as a Written Request for Provision of Data. (7) A telecommunications business operator shall, in accordance with the methods prescribed by Presidential Decree, notify details - 29 -