California Code, Business and Professions Code - BPC § 25503.19

(a) Nothing in this division shall prohibit the issuance or transfer of any retail on-sale general license to any person with respect to passenger cruise ships or lines owned by, or operated by or on behalf of, the licensee, notwithstanding that a manufacturer, winegrower, manfacturer's  1 agent, California winegrower's agent, rectifier, distiller, bottler, importer, or wholesaler holds the ownership of any interest, directly or indirectly, in the cruise ships or lines or in the retail licensee, subject to the following conditions:

(b) The Legislature finds that it is necessary and proper to require a separation between manufacturing interests, wholesale interests, and retail interests in the production and distribution of alcoholic beverages in order to prevent suppliers from dominating local markets through verticle  2 integration and to prevent excessive sales of alcoholic beverages produced by overly aggressive marketing techniques. The Legislature further finds that the exception established by this section to the general prohibition against tied interests must be limited to its express terms so as not to undermine the general prohibition, and intends that this section be construed accordingly.