Specifying the View-by date
If this option is on then a view-by date is set for protected images.
When the image is viewed
the current date is compared against the view-by date and if the view-by date has past
then the image isn't displayed and the "expired" message is displayed.
When specifying a date, ImageSafe accepts the day but not
the time of day. ImageSafe assumes the view-by time of day is the end of the view-by day.
(Actually 1 minute to midnight on that day).
The valid-until date for a password follows the same convention.