Part 9: Miscellaneous and general provisions Chapter 2: General Section 263: General definitions
Subsection (1) defines terms used throughout the Act. The definition of serious crime in this subsection is subject to the transitional provision in paragraph 6 of schedule 9.
	Subsections (2) to (4) set out the definitions of systems data and identifying data. Systems data is data which enables or facilitates, or otherwise relates to, the functioning of a postal service, telecommunications system or telecommunications service, or of any other relevant system (or service provided by means of that system). A communication or item of information may include data which may be used:
to identify, or assist in identifying, any person, apparatus, system or service;
to identify any event; or
to identify the location of any person, event or thing.
	In most cases this data will be systems data, however, there will be cases where this information does not enable or otherwise facilitate the functioning of a service or system and therefore is not systems data. Where such data, can be logically separated from the remainder of the communication or item of information and does not, once separated, reveal the meaning (if any) of any communication or item of information it is identifying data.