requirements established by an Act or legislation issued on the basis thereof. [RT I 2007, 12, 66 - entry into force 01.01.2008] § 438. Access to databases (1) The data processed by a database shall be accessible to the public unless access thereto is restricted by or on the basis of law. (2) [Repealed - RT I, 19.12.2012, 2 - entry into force 29.12.2012] (3) In recording data relating to security authorities in state databases, shadow information may be used based on a classified directive of the head of the security authority. [RT I 2007, 12, 66 - entry into force 01.01.2008] § 439. Support systems to state information system (1) The following support systems for the maintenance of databases shall be established by a Regulation of the Government of the Republic: 1) the classifications system; 2) the geodetic system; 3) the system of address details; 4) the system of security measures for information systems; 5) the data exchange layer of information systems; 6) the administration system of the state information system. (2) The Government of the Republic may grant the right to establish the support systems specified in subsection (1) of this section and the procedure for application of such systems to the relevant minister. (3) Use of support systems for the maintenance of the state information system is mandatory upon maintenance of all state and local government databases. The support systems specified in clauses (1) 1), 2), 4) and 6) of this section are mandatory for the maintenance of the database specified in subsection 433 (4) of this Act. (4) An exception to the requirement to use systems supporting the state information system may be made, with the approval of the Ministry of Economic Affairs and Communications, concerning a database founded for the performance of the duties arising from an international agreement. (5) Exchange of data with the databases belonging to the state information system and between the databases belonging to the state information system shall be carried out through the data exchange layer of the state information system. [RT I 2007, 12, 66 - entry into force 01.01.2008] Chapter 6 SUPERVISION § 44. Supervision over compliance with this Act Within the limits of their competence, the following shall exercise supervision over compliance with this Act: 1) the Data Protection Inspectorate pursuant to the procedure provided for in this Act; 2) a superior body or agency by way of supervisory control; 3) the Ministry of Economic Affairs and Communications pursuant to the procedure provided by this Act. [RT I 2007, 12, 66 - entry into force 01.01.2008]