You can delete WORM Snapshot copies that are retained beyond their retention period. WORM Snapshot copies are not deleted automatically. You must delete them when they expire. The expiry of snapshot copies is based on comparing the retention time of the snapshot copies with the volume ComplianceClock of the SnapLock volume.
system> snap delete wormvol slminutely.20040104_122040_GMT
Illegal operation on snapshot locked by SnapLock.