All (public)

Using the All (public) special user you can grant all users ownership rights to this data record. And for each data record you can set which rights should apply to the All (public) user.

For example
You create an appointment for a company outing. As a participant of the appointment you select All (public) and the Read right. Now all your colleagues will be able to view this appointment in their calendars, but they will not be able to change it.