The U.S. Patent and Trademark Office (PTO) has resurrected a previous policy that requires parties to a proceeding at the Patent Trial and Appeals Board to disclose all the parties of interest in the proceeding. PTO said this shift is driven in part by national security considerations, but the reversal forces participants in PTAB proceedings to disclose the identity of any affiliates that may have an interest in the outcome lest the petition for an administrative hearing be denied.