A person who intentionally and without lawful excuse –

(a) destroys, damages, erases or alters data stored in a computer; or

(b) interferes with, interrupts or obstructs the lawful use of a computer, a system of computers or any part of a system of computers or the data stored in that computer or system of computers –

is guilty of an offence and is liable on summary conviction to a fine not exceeding 20 penalty units and imprisonment for a term not exceeding 2 years.