code: def get_depot_key(self, depot_id, app_id=0):
          
          return self.send_job_and_wait(MsgProto(EMsg.ClientGetDepotDecryptionKey),
                                        {
                                         'depot_id': depot_id,
                                         'app_id': app_id,
                                        },
                                        timeout=15
                                       )
docs: Get depot decryption key
  
          :param depot_id: depot id
          :type depot_id: :class:`int`
          :param app_id: app id
          :type app_id: :class:`int`
          :return: `CMsgClientGetDepotDecryptionKeyResponse <https://github.com/ValvePython/steam/blob/39627fe883feeed2206016bacd92cf0e4580ead6/protobufs/steammessages_clientserver_2.proto#L533-L537>`_
          :rtype: proto message