Assigning permissions to use the safe
Granting access to the safe:
Log in as the system administrator.
Open the Workspace view.
Navigate to: Edu_Sharing_System › Edu_Sharing_Sys_ToolPermissions.
Locate the object "TOOLPERMISSION_CONFIDENTAL".
Invite the corresponding user or group to the object and give them "viewer" rights.
Make sure the "...and may publish" option in the rights drop down menu is switched off.

assigning access to the safe tool
Revoking access to the safe:
Log in as the system administrator.
Open the Workspace view.
Navigate to: Edu_Sharing_System › Edu_Sharing_Sys_ToolPermissions.
Locate the object "TOOLPERMISSION_CONFIDENTAL".
Un-Invite the corresponding user or group from the object (Open invite dialogue, select the "INVIDED" tab and press the "x" button for the desired entry.).