Actually i got on Fanpop and they had stuff that is in Season 3 DVD. Like deleted Scenes ect. and it included the full brain washing video. It is also label Dharma brain washing video so it IS Dharmas video. And how could the others alter it? That is a bit to far fetched IMO. Also I doubt the others needed to brain wash that much. Who would they brain wash before the Losties came? Plus they made no attempt to brain wash Sawyer, Kate, or Jack. When I watched the full video I knew it was Dharma. And not just because it was called "Dharma Brain Washing Video"

Ben was only a work man for Dharma also. Most of his time there not as a kid he was problaly secretly plotting with the others.

But more about Jacob. Less about the video.