The SECURE clause prevents operator-keyed data from appearing on the screen.
General Format
Syntax Rules
The SECURE clause is allowed only with input and update fields.
This clause can be specified on a group screen item, in which case it applies
to all suitable elementary items which are subordinate to that item.
SECURE and NO-ECHO are equivalent.
General Rules
When the SECURE clause is specified for input fields, only spaces and the
cursor appear in the screen item. For update fields, the original contents
of the field are displayed, but cannot be altered.