What does riplock mean?

I have seen some firmware hack says that it remove the riplock.
But I want to know what rip or riplock means?
PS : I am a newbie

rip - rest in peace?

no… riplock means that the ripspeed of the drive is locked, a ripunlocked fw improves the speed when ripping a dvd. http://club.cdfreaks.com/showthread.php?t=95708&highlight=riplock