Cal. Bus. & Prof. Code § 17603

In any case in which a business sends any goods, wares, merchandise, or products to a consumer, under a continuous service agreement or automatic renewal of a purchase, without first obtaining the consumer’s affirmative consent as described in Section 17602, the goods, wares, merchandise, or products shall for all purposes be deemed an unconditional gift to the consumer, who may use or dispose of the same in any manner he or she sees fit without any obligation whatsoever on the consumer’s part to the business, including, but not limited to, bearing the cost of, or responsibility for, shipping any goods, wares, merchandise, or products to the business.