Where's the evidence that this is an illegal download? There's a 'Report Bad Post' button for this sort of thing, and please leaving moderating to the staff.

@chong sparks: you'll have to demultiplex the audio and video of both movies, then swap the audio, get the delay setting right, and remultiplex them back together again.

DVD Decrypter will demultiplex but it depends on the type of audio (.mp2, AC3) as to which tool to use in getting it synchonised again.

I'll transfer this to the Video Edit software forum.