--- On Fri, 3/30/12, Michael <[email protected]> wrote:
> Is there any way for me to protect my
> DVDs and Blu-ray discs from being copied by my clients?
Yes and no.
Yes, there are many things you can do to the data structure of a DVD that will
make it slightly inconvenient to copy, while still allowing the disc to play
normally.
No because there are several companies constantly updating their copying
software to handle every new anti-copying trick.
One very common trick on DVDs is to muck up the TOC so it shows several "spoof"
copies of the main movie. A copying program that isn't capable of detecting
which is the real video and which are the decoys will put a real copy of all
the fakes onto the copy, massively compressing them so it looks terrible.
Easily defeated by copy programs that allow the user to manually select which
streams to copy, or copy programs that can follow the links to find that the
decoys aren't linked to anything.
Most copy protection eventually proves to be a waste of time and money. There's
not one bleeping thing you can do to absolutely stop people from copying a DVD.
Blu-Ray may be a bit harder but if there's any unhacked copy protection for it,
it's not going to last long.
The main problem for DVD was the engineers used only 40 unique decryption keys.
To make the format work, a chip with all 40 of the keys must be in every DVD
player and DVD-ROM drive. Not much of a secret when it's scattered across the
world a billion times. Once someone figured out how to extract the keys from
one chip, there was nothing to stop copying, just tricks with the data to
slightly delay the ability to make copies with each new release.
My advice is to not bother wasting time and/or money trying to copy protect
your DVD and Blu-Ray discs because anything you or any company that creates
protection schemes can come up with either already has been hacked or if it's
something truly new it will be hacked soon after* your discs hit the market.
Better to put that money in your bank account to have for more video projects.
*Or even before it hits the market. When AutoCAD first used a hardware copy
protection dongle, a hack was available for it at least a week prior to the
official release date, and that was in the late 1980's.
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