(1) Subject to the following provisions of this section, personal data must not be processed unless an entry in respect of the data controller is included in the register maintained by the Commissioner under section 19 (or is treated by notification regulations made by virtue of section 19(3) as being so included).
(2) Except where the processing is assessable processing for the purposes of section 22, subsection (1) does not apply in relation to personal data consisting of information which falls neither within paragraph (a) of the definition of "data" in section 1(1) nor within paragraph (b) of that definition.
(3) If it appears to the Secretary of State that processing of a particular description is unlikely to prejudice the rights and freedoms of data subjects, notification regulations may provide that, in such cases as may be prescribed, subsection (1) is not to apply in relation to processing of that description.
(4) Subsection (1) does not apply in relation to any processin