This Part does not, except to the extent that it does so expressly or by necessary implication, limit or restrict the operation of any other law or of any principle or rule of the common law or of equity, being a law, principle or rule:
(a) under or by virtue of which an obligation of confidence exists; or
(b) that has the effect of restricting or prohibiting, or imposing a liability (including a criminal liability) on a person in respect of, a disclosure or use of information.