How to create "Bad Sector" on DVD?

[yossy]

I want to protect my DVD-Video disc.
If there are some sample, please teach to me.
I am searching now, but can not find.
I wants to prevent casual copying.

Thank you.

[TippeX]

sigh, another one.. use the search button... this question is asked a lot, mostly by people wanting to 'protect' their warez that they are selling...
thread closed