Methods, apparatuses and storage medium associated with securely provisioning a digital content protection scheme are disclosed. In addition, the emitter includes a deterioration adjustment device which adjusts the deterioration of the emission characteristics over time in a predetermined type of light-emitting unit. The system performs the process. Correspondingly, a transmit power control method in a microwave system is also provided, which enables to switch to a low modulation mode as quickly as possible without causing the service impairment when the signal is deteriorated and enhances the system gain when the signal quality is improved.