Cal. Code Regs. tit. 3 § 562
In the event that any brand has been registered by an association whose members are engaged in receiving, producing, manufacturing, packing, canning, bottling, handling, or selling milk or any product of milk in containers on which such brand or any part thereof appears, such brand or part thereof may be used by all members of such association. Should any member of such association cease at any time to be a member for any reason whatever then such member shall thereafter have no right to use the brand, or any part of the brand registered by such association, whether the containers bearing such brand or part thereof shall have been acquired by such member before or after his membership shall have terminated. The foregoing shall apply to all brands registered by such association.
Cal. Code Regs. Tit. 3, § 562