California Code, Revenue and Taxation Code - RTC § 3376

(a) Upon request of the tax collector, the Controller shall provide to the tax collector information that is required for the preparation and enforcement of the sale of property under Part 6 (commencing with Section 3351) of Division 1. This information may include social security numbers.

(b) The tax collector or his or her designee shall certify, under penalty of perjury, to the Controller, that the information requested pursuant to subdivision (a) is required for the purposes specified in subdivision (a).

(c) Any information provided to the tax collector pursuant subdivision (a) is not a public record and is not open to public inspection.

(d) In the event of a tax-defaulted property sale, the tax collector or assessor shall include the outstanding balance of the property tax postponement loan in the minimum bid. Should the property fail to receive the minimum bid, and the minimum bid is reduced, all moneys paid to the Controller's office and county tax collector shall be a proportionate allocation of the total moneys owed.