If the zone is signed with a different way than 'dnssec-policy', use the legacy way of jittering signatures, that is calculate jitter by taking the two values of 'sig-validity-interval' and subtracting the second value from the first value.
If the zone is signed with a different way than 'dnssec-policy', use the legacy way of jittering signatures, that is calculate jitter by taking the two values of 'sig-validity-interval' and subtracting the second value from the first value.