Newsgroup: it.hobby.home-cinema
Titolo: superata la protezione dei DVD

da 
http://www.dvdfreax.com/dvdnews.html
November 2. 1999
The worst fear of movie studios has been realized: DVD movie encryption has
been broken.
A utility called DeCSS is currently floating around on the Net that will
read a DVD movie disc and save the file on a hard disk, minus the
encryption. All that’s required is a DVD-ROM drive -- since CD-ROM drives
can’t read the 4.7GB DVD movie discs -- and a lot of disc
space. The faster the CPU, the faster it will process the file. It takes
around 10 minutes to process a .VOB file on a 500MHz Pentium III. Following
the coming holiday season, it is estimated that over four million players
will be in use in the U.S. It's predicted that, by the end of 1999, over
4,000 movie titles will be available on DVD.
The hack opens up illicit online trading of DVD movies, although minus
DVD-ROM's interactive elements and outstanding audio/visual quality. The
utility, written by two European programmers requesting anonymity, uses DVD
playback code found in software-based DVD playback utilities, like WinDVD,
ATI DVD from ATI Technologies, and XingDVD. Every player has a DVD copy
protection decoder for playback, just like the hardware decoder in DVD
players from Toshiba, Sony, and other consumer electronics devices. One
programmer who examined DeCSS said the utility emulates that same playback
code. But instead of displaying the video and audio to screen, it simply
saves it back to the disk without encryption, since there is no encryption
in playback. "The bottom line is, if you have a decoder, it has to execute
somewhere. And that's always been the weak link, where you can get at the
encrypted material," said David Moskowitz, president of
Productivity Solutions, from King of Prussia, Pennsylvania. Getting the
decryption code, as it turns out, is relatively easy. Using an in-circuit
emulator -- a device used to monitor hardware activity -- Moskowitz was able
to watch exactly what the DVD hardware does in
decrypting the movie on his PC. "With that information, it's no big deal to
create the [cracking] application," he said. One programmer who had a
peripheral involvement in DeCSS development thinks piracy from this utility
is a non-issue. "There have been DVD ripping tools available for months,"
said Derek Fawcus, a programmer in England. "Among the things you can find
are explicit instructions and software for making VCD copies of DVDs. DeCSS
is simply the latest in a line of methods of doing this." Some of the DVD
decoder assembler code was released on the Internet, and Fawcus rewrote it
in C code.
That code was later used in DeCSS. Once decrypted, the DVD movie files,
which have a .VOB extension, are too big to fit on a CD-ROM. Most .VOB video
files are 1 GB in size, and a movie will be in three or four files. But
there are many DVD conversion utilities floating
around on DVD ripping sites, like DVDigest. It has conversion tools, like
DVD2MPG and VOBSplit, which can be used to convert a DVD movie into VCD
format, which can fit on a CD-ROM disc. There are even sites dedicated to
converting DVDs to VCD format. This means losing the interactivity of
DVD-ROM and its tremendous sound and video quality, but it also means VCDs
can be played on CD-ROM drives. It also makes it easier to trade the movie
online. Movie piracy has been a growing problem on the Internet, with films
traded in MPEG and AVI format via Web sites and private file transfer sites.
Movies in MPEG format are around 600 MB in size.

da 
http://www.dvdfreax.com/dvdnews.html
Beh, non è esattamente una novità...
DeCSS.zip versione 1.2.1b l'ho scaricato il 18/10, ed era uscito
parecchi giorni prima (l'eseguibile di questa versione -la più
recente- è datato 12/10).
 
---  Andrea Ferrari  -  
webm...@100siti.com
---  
http://www.100siti.com
 
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 is simply the latest in a line of methods of doing this."
Ecco, e' tutto qui.
Ma trasformare un DVD in VCD puo' davvero preoccupare cosi' tanto? La
differenza e' abissale.
--
Ciao
Gianmario
*********************************************************************
"Those who are skilled in combat do not become angered,
those who are skilled at winning do not become afraid.
Thus the wise win before the fight, while the ignorant fight to win."


No, il ripping su vcd si fa anche senza css: basta agganciare un encoder
MPEG-1 a un decoder MPEG-2 come un player DVD software. Il 'bello'
del DeCSS e' che e' finalmente possibile prendere un .vob da un
dvd, metterlo su hd, LEGGERLO da HD, metterlo su un DVD-R, LEGGERLO
da un DVD-R. Prima il file era illeggibile se non sul suo
supporto originale, a causa appunto della crittazione. In pratica,
e' ora possibile fare delle copie su DVD-R (o taaaanti CD-R)
di un DVD. Una possibilita' e' che questo spinga le major
a frenare sul dvd-r, perlomeno finche' non trovino una protezione
meno craccabile..