uspto.gov/CDNSKEY: The CDNSKEY RRset must be signed with a key that is represented in both the current DNSKEY and the current DS RRset. See RFC 7344, Sec. 4.1.
uspto.gov/CDS: The CDS RRset must be signed with a key that is represented in both the current DNSKEY and the current DS RRset. See RFC 7344, Sec. 4.1.