California Code, Revenue and Taxation Code - RTC § 19543

(a) “Business affairs,” as used in this article means the details relative to the business activities of the entity as disclosed by the return but shall exclude extraneous matters, such as the exact corporate title, corporate number, the date of commencement of business in this state, taxable year adopted, filing date of return, name, date and title of individuals signing affidavit to the return, due date of taxes, taxes unpaid, entity's address, private address of officers and directors.

(b) Extraneous matters shall not be disclosed unless the request for the information states the names of the entities as to which information is desired and only if there is no reason to believe that the information will be used for commercial list purposes.