Article 28. Time of sending and receiving the electronic document 28.1 If contract between parts does not set other cases, the moment when electronic document enters the information system out of control of sender or person acting on behalf of that is the time (date and time) of sending the electronic document. 28.2 If contract between parts does not set other cases, the moment when electronic document enters the information system shown by receiver is the time (date and time) of sending the electronic document. 28.3 Time indicator registration services may be used if time of sending and receiving causes dispute. Article 29. Storage of electronic document 29.1 Rule of storage of electronic document is set by legislation of the Republic of Azerbaijan considering following terms: 29.1.1 Electronic document shall keep structure that it was created, transmitted or received; 29.1.2 Electronic document shall be available for identification of its sender, receiver, time of sending and receiving; 29.1.3 information in electronic document shall be available for use in next reference; 29.1.4 term for storage of electronic document shall not be less than the period considered for paper document; 29.1.5 shall comply with other terms set by legislation and upon agreement of parts. 29.2 Article 29.1 of this law does not concern the electronic documents storage of which is not necessary. 29.3 Services of other legal and physical persons can be used by legislation of the Republic of Azerbaijan for storage of electronic documents. Article 30. Protection of electronic document 30.1 Programs and technical means shall be used by legislation of the Republic of Azerbaijan to protect electronic document during circulation of electronic document. 30.2 Required level of protection actions in information systems and networks used in electronic document circulation is assured by owner of these systems and networks. 30.3 Required level of protection actions in corporate information systems is assured by owner of this system by legislation of the Republic of Azerbaijan or upon agreement of participants. Article 31. Rights, duties and responsibilities of mediator 31.1 Services of mediator can be used while storing, transmitting and receiving electronic documents. 31.2 To ensure its activity mediator shall have the following: 31.2.1 technique and technologies assuring reliable use of system; 31.2.2 educated, experienced and competent personnel; 31.2.3 facilities admitting identification of time and source of served electronic documents; 31.2.4 reliable system to store information stated in Article 31.2.3 of this law.