ArcGIS Online feature service edit rights control

Idea created by GemeenteGoes on Sep 28, 2015
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    We ar using one feature layer in different apps, one is editable and the other non-editable for the public.
    http://goesweb.maps.arcgis.com/apps/SimpleViewer/index.html?appid=5fc5275ab2324d0597e9338849164790
    and the map is also embedded in a website http://www.mannee.info/vrije-kavels
    Currently we have to share this editable service with everyone to create a map that is shared with everyone. We can disable the editing in the webmap, but the service is still shared with everyone, so anyone with a arcgis online account could search for this layer and edit it. 
    I recieved a possible solution from Esri Netherlands support  (Laura van der Helm) that i want to share.
    She suggested to devide the feature service edit options into 3 catagories.
    1. editable / not editable for everyone
    2. editable for a specified group
    3. editable for our own organisation