Correct. You cannot conceal a fixed blade in CA (PC Section 12020), but you may open carry one. Fixed blades, regardless of carry, are not allowed in grade schools, or on a university campus if the blade is over 2.5 inches (PC Section 626.10). Certain cities such as the City of Los Angeles have banned the carry of any knife over 3.0 inches. I EDC my fixed blades within a Kydex drop loop sheath. My shirts typically cover the majority of the sheath.