The Protected Nodes offers some additional supports to views 2.x and 3.x in Drupal 6.x.
The additional support includes fields, filters, and sort capabilities that are added to the Node type. The join between the regular node and the protected node data is the node identifier (nid). This means the revision identifier is ignored.
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Password last changed
This value is the date when the password was last modified. You can display this date, filter using the date, and sort by date.
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Node is protected
This value is a yes/no value (i.e. Boolean) which can be displayed, used to filter protected or non-protected nodes, or to sort nodes (protected node first or last.)
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Protected node, but show title
This value is a yes/no value (i.e. Boolean) which defines whether the title of the node is public (yes) or also private (no.) The value can be displayed, used to filter nodes, or to sort nodes.