Cal. Pub. Cont. Code § 12156
(a) Except as provided in subdivision (b), no state agency shall purchase any printer or duplication cartridge for which the manufacturer, wholesaler, distributor, retailer, or remanufacturer places restrictions on the recycling or remanufacturing of that cartridge by any other person. For purposes of this section, these restrictions include, but are not limited to, all of the following:
(b) Notwithstanding subdivision (a), a manufacturer, wholesaler, distributor, retailer, or remanufacturer who establishes a recycling or remanufacturing program that is available to its customers may enter into signed agreements with those customers consenting to the return of the used cartridge to the manufacturer, wholesaler, distributor, retailer, or remanufacturer, only for either of the following purposes:
(e) As used in this section, the following terms mean: