The first electronic device which a young child autonomously uses, is most likely an audio device to chose their own music or stories. I am in my mid 30s now and we used cassette tapes, which we were pretty much a common standard back then. Nowadays multiple different licensing methods exists. Tonies, Kekz, Jooki, Coins, you name it. Every company has their own methods and ways to store, encrypt and work with audio files.
