DVD navigation

Stéphane Borel stef at via.ecp.fr
Mon Aug 13 23:16:49 CEST 2001


On Mon, Aug 13, 2001 at 09:09:21PM +0200, Samuel Hocevar wrote:
>    It has, but in order to decrypt CSS-encoded data, vlc needs a
> decryption key, and the process of generating the decryption key
> includes retrieving data from hidden parts of the DVD (through what is
> called DVD ioctls), which can't be done when the data has been copied to
> the hard disk.

As far as I know, libdvdcss doesn't use ioctls to decrypt the title key.
Unless it has changed lately, the decryption is a magic of statistics
and periodicity of the stream.

Only the disk key, which we don't use, needs ioctls to be decrypted.
That's what libcss did.

-- 
Stef




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