@startuml

actor "Customer" as user
participant "Device Hardware" as hw
participant "OS App" as app
participant "Server" as server
actor "Service Provider" as provider

hw <-> server: Same secret key for each devices and server

provider -> server: Generate Product Key
provider -> user: Provide Product Key

user -> app: Key in Product Key
app -> hw: Get info
hw --> app: HW info with own Device No.
app -> server: Product Key & Device No.
server -> server: Redeem Product Key \nEncrypt content with Device No. by secret key
server --> app: Encrypted content
app -> hw: Encrypted content
hw -> hw: Decrypt and validate with Device No.\nActivate device
hw --> app: Device activated successfully

@enduml