Re: [gentoo-user] Re: DVD Movie backups

[Neil Bothwick <neil@digimed.co.uk>]

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On Sun, 18 Dec 2011 10:49:34 +0100, David Haller wrote:

> >You also don't have the hardware to create them. CSS keys are stored
> >on a separate area of the disc, an area that is not available on
> >DVD-Rs, which is why you cannot copy a CSS-encrypted DVD with dd, it
> >copies the encrypted data but not the decryption keys.  
> 
> Sure they can be read and copied with ddrescue. On some disks at
> least. This one, I copied with ddrescue:
> 
> $ xine dvd://${PWD}/some_rather_recent_dvd.iso
> This is xine (X11 gui) - a free video player v0.99.6.
> (c) 2000-2007 The xine Team.
> libdvdread: Using libdvdcss version 1.2.11 for DVD access
> libdvdcss error: failed to open raw device, but continuing
> 
> libdvdread: Attempting to retrieve all CSS keys
> libdvdread: This can take a _long_ time, please be patient
> 
> libdvdread: Get key for /VIDEO_TS/VIDEO_TS.VOB at 0x00000130
> libdvdread: Elapsed time 0
> [..]
> 
> and the xine plays the .iso as usual. On the other paw, there's other
> discs where 'ddrescue' just causes those "scrambled sector" messages,
> but the images made with k3b works just fine:

I didn't say you can't read then, I said you can't write them, because
the key storage area is not writeable on DVD-R discs.

Yes, Joerg, I know people with your connections can get special discs and
drives, but for standard consumer hardware and media, what I said was
true.


-- 
Neil Bothwick

We shall shortly be landing. Please return your stewardess to
the upright position.

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