Cal. Civ. Code § 1798.83
(a) Except as otherwise provided in subdivision (d), if a business has an established business relationship with a customer and has within the immediately preceding calendar year disclosed personal information that corresponds to any of the categories of personal information set forth in paragraph (6) of subdivision (e) to third parties, and if the business knows or reasonably should know that the third parties used the personal information for the third parties’ direct marketing purposes, that business shall, after the receipt of a written or electronic mail request, or, if the business chooses to receive requests by toll-free telephone or facsimile numbers, a telephone or facsimile request from the customer, provide all of the following information to the customer free of charge:
(b)
(1) A business required to comply with this section shall designate a mailing address, electronic mail address, or, if the business chooses to receive requests by telephone or facsimile, a toll-free telephone or facsimile number, to which customers may deliver requests pursuant to subdivision (a). A business required to comply with this section shall, at its election, do at least one of the following:
(C) Make the designated addresses or numbers, or means to obtain the designated addresses or numbers, readily available upon request of a customer at every place of business in California where the business or its agents regularly have contact with customers.
The response to a request pursuant to this section received at one of the designated addresses or numbers shall be provided within 30 days. Requests received by the business at other than one of the designated addresses or numbers shall be provided within a reasonable period, in light of the circumstances related to how the request was received, but not to exceed 150 days from the date received.
(c)
(d) The following are among the disclosures not deemed to be disclosures of personal information by a business for a third party’s direct marketing purposes for purposes of this section:
(1) Disclosures between a business and a third party pursuant to contracts or arrangements pertaining to any of the following:
(E) Jointly offering a product or service pursuant to a written agreement with the third party that receives the personal information, provided that all of the following requirements are met:
(e) For purposes of this section, the following terms have the following meanings:
(6)
(A) The categories of personal information required to be disclosed pursuant to paragraph (1) of subdivision (a) are all of the following:
(7) “Personal information” as used in this section means any information that when it was disclosed identified, described, or was able to be associated with an individual and includes all of the following:
(8) “Third party” or “third parties” means one or more of the following:
(f)
(1) Disclosures of personal information for direct marketing purposes between affiliated third parties that share the same brand name are exempt from the requirements of paragraph (1) of subdivision (a) unless the personal information disclosed corresponds to one of the following categories, in which case the customer shall be informed of those categories listed in this subdivision that correspond to the categories of personal information disclosed for direct marketing purposes and the third party recipients of personal information disclosed for direct marketing purposes pursuant to paragraph (2) of subdivision (a):