PUBLIC MARKS with tag LOD

To help you get started (and since linked data applications are a little different from your average Web application), we thought we’d provide a sample application and detailed information about how we built it.

Fair enough. So assuming we use the WebAccessControl vocabulary in an access control file (ACF) to restrict access to a resource on the Web. So, how exactly should the interaction take place? What should we use as a @rel-value for the HTTP Link: header? Does it make sense for the user agent (UA) to evaluate the ACF? Is the ACF discovery necessary at all?