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

[Mark Knecht]

On Sat, Dec 17, 2011 at 3:03 PM, Neil Bothwick <neil@××××××××××.uk> wrote:
> On Sat, 17 Dec 2011 20:13:43 +0000 (UTC), Grant Edwards wrote:
>
>> Yep.  I'm not aware of any Linux software that can create an encrypted
>> DVD -- but I've never had a desire to do that, so my lack of knowlege
>> of such a thing shouldn't be used as an indication of non-existence of
>> such a thing. :)
>
> 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 yo cannot copy a CSS-encrypted DVD with dd, it copies the
> encrypted data but not the decryption keys.
>
>
> --
> Neil Bothwick

Interesting but still a little confusing. My DVD-RW drive can
apparently _read_ the CSS keys because xine can play the DVD. I'm
assuming here that the Linux DVD libraries need the keys but maybe
they don't actually even need them to play a DVD if the encryption can
be broken without the keys.

I guess you are saying that either the CSS keys are completely
unnecessary, or that the DVD-RW drive can read but not write to the
area where they are stored?

Thanks,
Mark