# Check if the response indicates a valid activation key if response.json()['valid']: print('Activation key verified successfully.') return True else: print('Invalid activation key.') return False

If you do not have a key, you can purchase a verified license from these authorized retailers: ChessBase Official Shop

Access to these services is contingent upon entering a linked to the user’s AVM account.

but lost the key or cannot activate, contact ChessBase directly using their support form – they are surprisingly helpful for verified owners.