Cal. Fish & Game Code § 1769

The department may take all appropriate measures to encourage persons to obtain annual wildlife area passes and day use passes issued pursuant to Section 1765, and to promote the sale of native species stamps, promotional materials, and nature study aids to provide revenue for the support of the department. The measures may include, but are not limited to, the dissemination of public information concerning the status of wildlife, fish, and plant species, conservation activities of the department, and programs and facilities provided by the department for the enjoyment of the lands managed by the department.