On the Access rights tab, which is present when you have selected a new or existing field in a database, you determine the access rights for this field, to restrict access to records, dependent on the user (login name in Windows) and its assigned role.
Click here for information on how to edit properties in general. On the current tab you'll find the following settings:

Access

Here you may define which Roles have which Access rights to this field. You can indicate for each role whether no access (None), Read access, Write access or Full access must apply. If a role is not linked to this field, then each user linked to that role has full access by default. A user without a role always has full access.
Users are assigned to roles in the application setup.

Instead of assigning identical access rights per field, you may choose to do that in batch for a selection of fields at once: in the Application browser Field list display (the right window pane which will be shown after you click the Fields list header in the tree view on the left), simply select all the fields to which you'd like to assign identical access rights (use Ctrl+clicking or Shift+clicking), right-click your selection and choose Set access rights in the pop-up menu which has opened.
The Set access rights window will open, allowing you to set access rights per role in almost the same way as you would on the Access rights properties tab, but for all selected fields at once. If any of the selected fields already contain access rights for roles, then those will be overwritten as far as you specify them here in the Set access rights window: other access rights will remain as they were while previously unspecified roles will be added, together with their new access rights, if you specify them now.

See also

Security in Collections