California Code, Public Resources Code - PRC § 8503

Customary or established use as graziers, otherwise than under operation of law, as used in this article, includes the continuously open, notorious, peaceable and public use of such range, seasonally, for a period of five years or longer immediately prior to August 21, 1933, excepting adverse climatic conditions, by the person or his grantors or predecessors in interest except in cases where initiated without protest or conflict to prior use or occupancy thereof. Any change in such customary use so established shall not be made hereafter so as to prevent, restrict or interfere with the customary or established use of any other person or persons.