The department may, under AS 44.62 (Administrative Procedure Act), adopt regulations necessary for the execution of the functions vested in it by AS 21.40.010 - 21.40.060, and may for that purpose classify domestic stock insurance companies, securities, and other persons or matters within its jurisdiction. A provision of AS 21.40.010 and 21.40.020 imposing a liability does not apply to an act done or omitted in good faith in conformity with a regulation of the department, notwithstanding that the regulation may, after the act or omission, be amended or rescinded or determined by judicial or other authority to be invalid for any reason.