Cal. Civ. Proc. Code § 2025.420
(b) The court, for good cause shown, may make any order that justice requires to protect any party, deponent, or other natural person or organization from unwarranted annoyance, embarrassment, or oppression, or undue burden and expense. This protective order may include, but is not limited to, one or more of the following directions:
(f) The court shall limit the frequency or extent of discovery of electronically stored information, even from a source that is reasonably accessible, if the court determines that any of the following conditions exist:
(i)