Direct editing of VOB's audio track for media serialization purpose?

Hi everybody!

We want to protect our DVDs (they are not in mass production, and we burn them on our PC ) from being ripped and uploaded on YouTube. :sad:

Can someone suggest what software is there that would let me change a few bits of the audio track inside a VOB file for media serialization purpose? And to do it in such a way that would withstand the losses during the audio format conversions? :flower: