Hi Ben Hall,
Thank you for using our services.
What you could do in the current architecture would be to define roles which can see the control. If the user is logged in and belongs to either of the roles than the public content view control is rendered if not then do not render the control. You can take a look at this blog post for some tips on how to achieve this: Roles Selector and hiding control based on user's roles
If you however wish to have further security implementations you should wait for Sitefinity 4.0.
All the best,
the Telerik team
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