Field Readonly displays non-accessible fields in edit forms as read-only items.
Modules like the essential Field Permissions allow to make fields non-accessible, aka private, by completely hiding them in edit forms even if user has the permission to view them. Field Readonly lets you display these fields back in edit forms, rendered the same way as in view mode.
This module provides an extra tab on every node that is part of a book. This tab allows users with the right permissions to change the order of the book node's child nodes.