Re: What do people use public suffix for?

If the DS record identifies a different signer, then you have an administrative split, or if the e-mail address field in the SOA fields of the parent zone are different, then you have an administrative split, OR if one of the two zones has RP (responsible party records), and the list of RP records are different for the two zones, then you have an administrative split.

Sigh. See messages from about an hour ago about why zone cuts aren't the same as management boundaries. Sprinking DNSSEC pixie dust on the zone cuts doesn't change that.