(a) section 503A is not a valid law of the Commonwealth (in whole or in part); and
(b) the Minister made a decision under section 501, 501A, 501B, 501BA, 501C or 501CA before the commencement of this section;
the decision is not invalid, and is taken never to have been invalid, merely because:
(c) the Minister:
(i) relied on; or
(ii) had regard to; or
(iii) failed to disclose in accordance with any applicable common law or statutory obligation;
information that was covered, or purportedly covered, by subsection 503A(1) or (2); or
(d) the Minister made the decision on the basis of an erroneous understanding of:
(i) section 503A; or
(ii) the protection that section 503A would provide against an obligation to disclose information.
(2) However, subsection (1) does not affect rights or liabilities arising between parties to proceedings in which:
(a) judgment is reserved by a court as at the commencement of this section; or
(b) judgment has been delivered by a court before the commencement of this section;
and the judgment sets aside, or declares invalid, a decision made by the Minister under section 501, 501A, 501B, 501BA, 501C or 501CA.