I did something similar. I would get about as far as writing the interesting mechanic/game logic and then give up.

You guys have projects that end??

Yeah seriously. The day news of this broke, I switched my book library over to Calibre+DeDRM and put my device in airplane mode.

Yes, the circuit in an rfid device gets its power by harvesting energy from the RF source it’s being illuminated with. A smaller version of wireless power transmission first invented by Tesla (the person, not the car company). Similar principles were used in the Cold War for surreptitious listening devices. Neat tech.