I have seen 2 cases:
– a high score in a simple dvd game.
– a play once dvd
The play once dvd sets a flag somewhere after you finished watching it (5min clip). In this case it survived in a reboot.
In the game case, I dont really remember if a reset was done. But it did survive between changing a few discs and comming back to the game again.
So, If anyone has a clue about this… 🙂