A Study to Test the Efficacy and Safety of Riliprubart Against the Usual Treatment of Intravenous Immunoglobulin (IVIg) in People With Chronic Inflammatory Demyelinating Polyneuropathy (CIDP)

Inclusion Criteria: Participants are eligible to be included in the study only if all of the following criteria apply: * Participant must have CIDP or possible CIDP criteria, based on European Academy of Neurology (EAN)/Peripheral Nerve Society (PNS) Task Force CIDP guidelines, second revision (2021). * Participant must have either typical CIDP, or one of the following 2 CIDP variants: motor CIDP, multifocal CIDP (also known as Lewis Sumner Syndrome). Diagnosis must be confirmed by the study adjudication committee. * Participants must have responded to IVIg in the past 5 years. * Participant must be on a stable maintenance dosage of IVIg. * Participant must have residual disability, defined as an INCAT score of 2 to 9 at Screening that is confirmed at baseline (a score of 2 should be exclusively from leg disability component of INCAT). * Participant must be receiving treatment with IVIg within a standard maintenance dosing regimen, defined as per EAN/PNS 2021 CIDP guidelines. * Participants receiving IVIg infusions at home are eligible, as long as IVIg infusions are switched to a hospital or infusion center setting at least 1 cycle prior to baseline. * Participant must have active disease, defined by a CIDP disease activity score (CDAS) of ≥2 points at Screening. * Participant must have documented vaccinations against encapsulated bacterial pathogens given within 5 years prior to Day 1 or initiated a minimum of 14 days prior to first dose of study intervention. * Contracept…