public static IEnumerable <string> UsersWithReadAccess(this IContentSecurable contentSecurable)
 {
     return(ContentExtensions.SecurityEntityWithReadAccess(contentSecurable, SecurityEntityType.User));
 }
 public static IEnumerable <string> RolesWithReadAccess(this IContentSecurable contentSecurable)
 {
     return(Enumerable.Union <string>(ContentExtensions.SecurityEntityWithReadAccess(contentSecurable, SecurityEntityType.Role), ContentExtensions.SecurityEntityWithReadAccess(contentSecurable, SecurityEntityType.VisitorGroup)));
 }