4. Where the certificate of registration of illegal wiretapping equipment detection service has been leased to other persons; 5. Where serious damage has been done to other persons by intention or gross negligence in connection with business activities; 6. The revocation of registration has been requested by the State or local governments under the provisions of other statutes. Article 11 (Confidentiality Obligation) (1) Any public official or former public official who has been engaged in the permission, execution, notice, and preparation of various documents, etc. in connection with the communication-restricting measures shall be prohibited from disclosing or divulging matters concerning the communicationrestricting measures he or she has learned while performing his or her duties. (2) The current or former employee of any communications institution shall be prohibited from disclosing or divulging matters concerning the communication-restricting measures. (3) Any person other than those under paragraphs (1) and (2) shall be prohibited from disclosing or divulging what he or she has learned in connection with the communication-restricting measures except where he or she uses said knowledge according to this Act. <Amended on, Mar. 20, 2018> (4) Matters necessary to keep secret procedures for granting permission, whether to grant permission, the contents of permission, etc. for the communication-restricting measures by the court shall be prescribed by the Supreme Court Regulations. Article 12 (Restriction on Using Materials Acquired through Communication-Restricting Measures) Mail or its contents and contents of any telecommunications acquired through execution of the communication-restricting measures under Article 9 shall not be used except in the following cases: 1. Where they are used to investigate or prosecute the crimes under Article 5 (1) that have become the objective of the communication-restricting measures or the crimes related hereto, or prevent such crimes; 2. Where they are used in disciplinary proceedings for crimes under subparagraph 1; 3. Where a party concerned with communication uses them in a claim for damages; 4. Where they are used under the provisions of other statutes. @Article 12-2 (Management of Materials Acquired through Communication-Restricting Measures on Internet Connections for Criminal Investigation) (1) Where a prosecutor executes communication-restricting measures under Articles 6 or 8 (limited to emergency communication-restricting measures on persons falling under the requirements under Article 5 (1)) regarding contents of telecommunications transmitted and received through internet connections and intends to use or store for the purpose of using (hereafter in this Article referred to as “storage, etc.”) such contents in accordance with subparagraph 1 of Article 12, he or she shall select the contents of