California Code, Code of Civil Procedure - CCP § 917.5

The perfecting of an appeal shall not stay enforcement of the judgment or order in the trial court if the judgment or order appealed from appoints a receiver, unless an undertaking in a sum fixed by the trial court is given on condition that if the judgment or order is affirmed or the appeal is withdrawn, or dismissed, the appellant will pay all damages which the respondent may sustain by reason of the stay in the enforcement of the judgment.