I have a request for an audio player. The 12 audio files will be stored in a SD card (either mp3 or wav).

Each file will be 30 sec long and after user selection, it will be played in a loop.

All these are easy to implement with a DF Player and a PIC.

But we need the files to be locked so that cannot be copied from the SD card and played in another player from ours.

Any ideas welcome.

Ioannis