RPC1 patch : makes it region free (RPC1) instead of region selected (RPC2)
Bitsetting: Bitsetting makes +R/W discs more compatible with set-top DVD players and Xbox/PS2
RPC2 auto reset: resets the amount of times you may change from one region to another. Normally this is 5 times. Once is already set by the manufacturer (to make it shippable to your region of this planet). When the counter hits 0 you are forced to watch only movies in that last selected region. Auto reset makes it 5 times again each time you power on your computer.