Cal. Bus. & Prof. Code § 19520
(a)
(1) Every person not required to be licensed under Article 4 (commencing with Section 19480) who participates in, or has anything to do with, the racing of horses in any of the following capacities shall be licensed by the board pursuant to rules and regulations that the board may adopt and upon the payment of a license fee fixed and determined by the board:
(d) For purposes of this section, the following definitions apply: