DNSSEC is a GTM add-on licensing feature.
DNSSEC is a GTM add-on licensing feature.
DNSSEC is not an add-on licensing feature for GTM (Global Traffic Manager). Instead, it is a feature available when the BIG-IP system is licensed for BIG-IP DNS. Therefore, the statement is false.
If you have GTM licensed you don't need an extra license for DNSSEC "The DNSSEC feature is available only when the BIG-IP system is licensed for BIG-IP DNS." https://techdocs.f5.com/kb/en-us/products/big-ip-dns/manuals/product/bigip-dns-services-implementations-12-1-0/6.html