A method and system for performing a redemption transaction by leveraging a payment network provides a way to conduct redemption transaction without requiring changes to merchant or acquirer infrastructure. Responding includes receiving an indication of the use of the controlled content including a context of the use of the controlled content, automatically determining using the context an engagement action for responding to the use, and automatically initiating the engagement action. Thus, a small-sized optical information processing apparatus having multiple arrays and a high pixel density can be realized. The motor is accordingly driven, and the feedback control based on the difference between the target position and the present position is restarted.