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john r pierce wrote:
> steve@vigra.com (Steve Haehnichen) wrote:
>
> >Sure. If the DVD is unencrypted, then most DVD-ROM drives should be
> >able to read the .IFO and .VOB files right from it. (I'm not at all
> >clear on how the decryption works for protected DVD.)
>
> Are you ready ? The holly$wood folks insisted that the DVD-ROM
drives refuse to
> even let the operating system read the encrypted media if you don't
have the
> magic passwords. The encrypted data can only be decoded by a
licensed DVD MPEG
> decoder chip even if you CAN get it out of the rom drive. The 'magic
passwords'
> referred to above are a very complex challenge-handshake algorithm
that I'm
> surprised hasn't tripped off the stupid DOD export restrictions (oh
yeah, we are
> IMPORTING these from japan). The algorithms and decryption keys etc
are all
> being kept as licensed trade secrets that are very VERY hard to get
ahold of
> even if you ARE a equipment manufacturer (unless your name happens to
be Toshiba
> or Sony).
>
>
> >On my Creative Labs DVD Encore, I can drag & drop the DVD (.VOB)
files
> >to hard disk, and play them from there. It will even play these
files
> >from a network drive.
> >
> >On my protected DVD disks, it won't let me read the files, only play
> >them.
> >
> >> I am aware that the entertainment industry has tried thwart access
> >> to this sort of functionality in the USA, but is there any way to
> >> get unencrypted, uncompressed DVD into a PC's RAM directly?
> >
> >All DVD video is compressed. And would you really want to be
slinging
> >around 2 hours of uncompressed video anyway?
>
> Hey, uncompressed 4:2:2 video is ONLY 26 megabytes/second :)
>
> lets see... 2 hours ... 26MB/sec... Hey, thats ONLY 187 gigabytes,
no problemo!
>
> seriously tho... no, you can't even get the unencrypted raw MPEG-2
data, which
> is more like 1MByte/sec (7GB for that same two hours). Only the DVD
MPEG
> decoder actually knows the encryption key and algorithm to decode it,
and it by
> legally binding contract can only output raw video to the screen
after its
> decoded it.
>
> -jrp
>
>
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>
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