Cal. Bus. & Prof. Code § 10142

When a licensee prepares or has prepared an agreement authorizing or retaining that licensee to perform any of the acts for which he or she is required to hold a license, or when that licensee secures the signature of any person to any contract pertaining to those services or transactions, he or she shall deliver a copy of the agreement to the person signing it as soon as reasonably practicable after the time the signature is obtained. The copy may be provided electronically in transactions pursuant to provisions of the Uniform Electronic Transactions Act (Title 2.5 (commencing with Section 1633.1) of Part 2 of Division 3 of the Civil Code), where the parties have agreed to conduct the transaction by electronic means.