watchDNS/gtld-servers.netについて、ここに記述してください。

net NSが存在するgtld-servers.net ドメインはDNSSECを採用していない。

この返事はどういうつもりなのか。

$ dig +norec +dnssec -t ds gtld-servers.net @av1.nstld.com

; <<>> DiG 9.9.5-3ubuntu0.8-Ubuntu <<>> +norec +dnssec -t ds gtld-servers.net @av1.nstld.com
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 36495
;; flags: qr; QUERY: 1, ANSWER: 0, AUTHORITY: 13, ADDITIONAL: 20

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags: do; udp: 4096
;; QUESTION SECTION:
;gtld-servers.net.              IN      DS

;; AUTHORITY SECTION:
.                       518400  IN      NS      l.root-servers.net.
.                       518400  IN      NS      m.root-servers.net.
.                       518400  IN      NS      a.root-servers.net.
.                       518400  IN      NS      b.root-servers.net.
.                       518400  IN      NS      c.root-servers.net.
.                       518400  IN      NS      d.root-servers.net.
.                       518400  IN      NS      e.root-servers.net.
.                       518400  IN      NS      f.root-servers.net.
.                       518400  IN      NS      g.root-servers.net.
.                       518400  IN      NS      h.root-servers.net.
.                       518400  IN      NS      i.root-servers.net.
.                       518400  IN      NS      j.root-servers.net.
.                       518400  IN      NS      k.root-servers.net.

;; ADDITIONAL SECTION:
l.root-servers.net.     3600000 IN      A       199.7.83.42
m.root-servers.net.     3600000 IN      A       202.12.27.33
m.root-servers.net.     3600000 IN      AAAA    2001:dc3::35
a.root-servers.net.     3600000 IN      A       198.41.0.4
a.root-servers.net.     3600000 IN      AAAA    2001:503:ba3e::2:30
b.root-servers.net.     3600000 IN      A       192.228.79.201
c.root-servers.net.     3600000 IN      A       192.33.4.12
d.root-servers.net.     3600000 IN      A       128.8.10.90
e.root-servers.net.     3600000 IN      A       192.203.230.10
f.root-servers.net.     3600000 IN      A       192.5.5.241
f.root-servers.net.     3600000 IN      AAAA    2001:500:2f::f
g.root-servers.net.     3600000 IN      A       192.112.36.4
h.root-servers.net.     3600000 IN      A       128.63.2.53
h.root-servers.net.     3600000 IN      AAAA    2001:500:1::803f:235
i.root-servers.net.     3600000 IN      A       192.36.148.17
j.root-servers.net.     3600000 IN      A       192.58.128.30
j.root-servers.net.     3600000 IN      AAAA    2001:503:c27::2:30
k.root-servers.net.     3600000 IN      A       193.0.14.129
k.root-servers.net.     3600000 IN      AAAA    2001:7fd::1

;; Query time: 149 msec
;; SERVER: 192.42.177.30#53(192.42.177.30)
;; WHEN: Tue Jun 28 17:18:27 JST 2016
;; MSG SIZE  rcvd: 629