Cal. Bus. & Prof. Code § 16606 : CALIFORNIA BUSINESS AND PROFESSIONS CODE — GENERAL BUSINESS REGULATIONS — PRESERVATION AND REGULATION OF COMPETITION — CONTRACTS IN RESTRAINT OF TRADE — Customer list of telephone answering service

The customer list, including the names, addresses, and identity of customers, of a telephone answering service shall constitute a trade secret and confidential information of, and shall belong to, the owner of the telephone answering service.