Please pay special attention
to the edit mode tool bar options for batch setting permissions:
With 'Apply changes to all subitems', which is enabled by default in
the tool bar,
all permissions granted or denied for a parent folder will also be applied to all sub-items.
With 'Retain invisible items', print, save, and edit permissions can be granted or denied for folders and their sub-items, but so far invisible items will be exempt.
With 'Retain higher permissions', view, print, and save permissions can be granted for folders and their sub-items, but all already granted higher permissions will be retained.