(b) the existence or identity of a confidential source of information relating to the enforcement of a criminal law; (c) the provision of services directly related to communications infrastructure, public utilities or public key infrastructure; or (d) the protection of public safety including system related to essential emergency services. (2) A person, who wilfully, without lawful excuse, accesses the whole or any part of a protected computer, commits an offence punishable on conviction, to imprisonment for a period not exceeding 7 years. (3) For the purposes of any prosecution under this section, it shall be presumed, until the contrary is proved, that the accused has the requisite knowledge referred to in this section if there is, in respect of the computer, program or data, an electronic or other warning exhibited to the accused stating that unauthorised access to that computer, program or data is an offence. 7 Illegal interception A person who intentionally, without right and with dishonest or otherwise unlawful intent, intercepts or attempts to intercept by technical means: (a) a transmission not intended for public reception of electronic data to, from or within an electronic system; or (b) electromagnetic emissions from an electronic system, commits an offence punishable on conviction, to imprisonment for a period not exceeding 7 years. 8 Illegal data interference A person who, wilfully or recklessly, without lawful excuse: (a) damages or deteriorates electronic data; or (b) deletes electronic data; or (c) alters electronic data; or (d) renders electronic data meaningless, useless or ineffective; or (e) obstructs, interrupts or interferes with the lawful use of electronic data; or (f) obstructs, interrupts or interferes with any person in the lawful use of electronic data; or 6