Wishing to use Rockbox-based MP3 player for internal incentive program. To make it work for the incentive program need it to do the following:
a) Each time the system is accessed, check whether a date (stored as a file on the player) has passed if so display a message (stored as text in the same same file above). If date has not passed, let the user access any of the system functionality.
b) Disallow user from using Rockbox to delete files on player.