Prob. Code, § 5508

(a) A registering entity is not required to offer or to accept requests for security registration in beneficiary form. If a registration in beneficiary form is offered by a registering entity, the owner requesting registration in beneficiary form assents to the protections given to the registering entity by this part.

(b) By accepting a request for registration of a security in beneficiary form, the registering entity agrees that the registration will be implemented as provided in this part.

(c) A registering entity is discharged from all claims to a security by the estate, creditors, heirs, or devisees of a deceased owner if it registers a transfer of the security in accordance with Section 5507 and does so in good faith reliance (1) on the registration, (2) on this part, and (3) on information provided to it by affidavit of the personal representative of the deceased owner, or by the surviving beneficiary or the surviving beneficiary’s representatives, or other information available to the registering entity. The protections of this part do not extend to a reregistration or payment made after a registering entity has received written notice from any claimant to any interest in the security objecting to implementation of a registration in beneficiary form. No other notice or other information available to the registering entity shall affect its right to protection under this part.

(d) The protection provided by this part to the registering entity of a security does not affect the rights of beneficiaries in disputes between themselves and other claimants to ownership of the security transferred or its value or proceeds.