Re: [gentoo-user] Re: Copying encrypted files from a DVD

Stroller <stroller@××××××××××××××××××.uk> wrote:

>
> On 16 May 2009, at 15:56, Grant Edwards wrote:
> > On 2009-05-16, Ricardo Bevilacqua <rus.spes@×××××.com> wrote:
> >
> >> Why don't you use the (very old, but still effective) dd [1]
> >> command to create an ISO image?
> >
> > Because it won't work.
> >
> > Have you tried it with an encrypted DVD?
>
> It'll work fine & I do it all the time before I decrypt & rip DVDs.
>
> >> dd if=/dev/<your-dvd-device> of=<some-path>/bakup.iso bs=2048
> >> conv=sync,notrunc
> >>
> >> That will make an exact copy of your DVD into your hard disk.
> >
> > No, it won't.  Commercially sold audio and video DVDs are
> > encrypted so the DVD drive can't read them unless you load a
> > decryption key into the DVD drive.  DVD players have keys built
> > into them.  There are software packages like DeCSS and
> > libdvdcss that either have a built-in key or know how to figure
> > one out.
>
> It WILL make an exact copy of the DVD onto the drive (assuming DVD
> video, and no ARccOS [1]), it will just be an exact copy of the
> *encrypted* movie. It won't be playable without an additional
> decryption step (although mplayer can include this step
> automagically), but it will be an *exact* copy.

Even with a DVD-Video, you will not be able to make a copy of the DVD
using dd if the DVD is using CSS.

The sectors that are carrying content from VOB files will not be redable before
you unlock the drive using e.g. dvdbackup.

Jörg

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