For lite-ons I think you have to modify the drive a bit to be able to dump they firmware (and get the key). I've never had a lite-on so I've never dont it, but there some kind of connections you have to cut or something.
The older benq's didn't need any modifications. A little trick to put the drive in recovery mode (turn on for 2 seconds, turn off for 2 seconds, turn back on) and you're good to go.
Probably not alot of moddable benqs left after the last wave, but I survive the banwave, so the new firmware is appreciated.