42 stipulate or prescribe, this section shall apply to the submission of the foregoing documents using the Internet. 68I Obligations, indemnities and presumptions with respect to digital signatures (1) If the security of a digital signature allocated to a registered user has been compromised in any manner the registered user shall inform the Commissioner in writing of that fact without delay. (2) No liability shall attach to the Commissioner, the Zimbabwe Revenue Authority or any officer or employee thereof for any failure on the part of a registered user to ensure the security of the digital signature allocated to him or her and, in particular, where electronic data authenticated by a digital signature is received by the Commissioner or the Zimbabwe Revenue Authority— (a) without the authority of the registered user to whom such signature was allocated; and (b) before notification to the Commissioner or the Zimbabwe Revenue Authority by the registered user that the security of the digital signature allocated to him or her has been compromised; the Commissioner or the Zimbabwe Revenue Authority shall be entitled to assume that such data has been communicated by, or with the authority of, the registered user of that digital signature. (3) Where in any proceedings or prosecution under this Act or in any dispute to which the Zimbabwe Revenue Authority is a party, the question arises whether a digital signature affixed to any electronic communication to the Commissioner or the Zimbabwe Revenue Authority was used in such communication with or without the consent and authority of the registered user, it shall be presumed, in the absence of proof to the contrary, that such signature was so used with the consent and authority of the registered user. 68J Alternatives to electronic communication in certain cases (1) Whenever a computer system established in terms of section 68C or any other computer system of a registered user is inoperative, the registered user and the Commissioner shall communicate with each other in writing in the manner prescribed in this Act. (2) The Commissioner may at any time require from any registered user the submission of any original document required to be produced under any of the provisions of this Act. 68K Unlawful uses of computer systems (1) A person who, not being the registered user of a digital signature to whom it is allocated, uses such a signature in any electronic communication to the Commissioner or the Zimbabwe Revenue Authority without the authority of such registered user, commits an offence and is liable to a fine not exceeding level twelve or to imprisonment for a period not exceeding ten years or to both such fine and such imprisonment. (2) A person who—