Cal. Code of Civil Procedure § 1725

(a) If all of the following conditions are satisfied, a person against whom a foreign-country defamation judgment was rendered may seek declaratory relief with respect to liability for the judgment or a determination that the judgment is not recognizable under section 1716: (1) The person is a resident or other person or entity amendable to jurisdiction in this state. (2) The person either has assets in this state that may be subject to an enforcement proceeding to satisfy the foreign-country defamation judgment or may have to take actions in this state to comply with the foreign-country defamation judgment. (3) The publication at issue was published in this state. (b) A court of this state has jurisdiction to determine a declaratory relief action or issue a determination pursuant to this section and has personal jurisdiction over the person or entity who obtained the foreign-country defamation judgment. (c) This section shall apply to a foreign-country defamation judgment regardless of when it was rendered.