in src/main/scala/security/UserTier.scala [39:45]
def apply(from:String):Option[UserTier] = from match {
case "developer"=>Some(DeveloperTier)
case "rights-managed"=>Some(RightsManagedTier)
case "external"=>Some(ExternalTier)
case "internal"=>Some(InternalTier)
case _=>None
}