No records of any type in any form whether copies, compilations or reproductions pertaining to any individual or employing unit obtained in the course of or growing out of the administration of this chapter, or oral testimony relative thereto, as to either a specific person or in general shall be available for use in any proceeding, administrative or judicial; except that a necessary party to a proceeding directly and primarily concerned with workmen’s compensation or an employer-employee relationship may by the use of valid judicial process obtain such records as directly relate to the necessary parties to the proceeding, and otherwise as is provided by this chapter. In matters unrelated to those enumerated previously, such records and oral testimony shall be available for use in any proceeding, administrative or judicial, where the state is a necessary party. No oral or written policy statements, opinions, advice, instructions or information of the department as to a specific person or in general shall be available for use in any proceeding, administrative or judicial through any means, and any process which attempts to obtain such shall be null and void.