On Mon, Nov 25, 2002 at 02:01:33AM -0600, Jason Pepas wrote: > On Sunday 24 November 2002 11:25 pm, Noah L. Meyerhans wrote: > > On Sun, Nov 24, 2002 at 10:50:38PM -0600, Ron Johnson wrote: > > > Just now, when I tried to cp the *.VOB files from a movie disk > > > mounted udf onto /dvd-rw, I got the same "Input/output error". > > > > Believe it or not, this is a function of the fact that the DVDs are > > encrypted. I don't remember what the heck it is that you have to do to > > actually get enough of a handle on the data to be able to use something > > like DeCSS on it. I saw an interesting talk entitled "Decrypting DVD" > > at MIT a couple of years ago, and this is the first I've thought of it > > since then. Hell, I probably couldn't tell you how to do it, even if I > > did remember, without the MPAA sending the FBI after me for a DMCA > > violation. 8^( > > > > But whatever the case, you will not be able to copy .vob files from a > > DVD using normal tools like cp. > > > > noah > > last night I was able to copy vob files from the dvd with no problem. This > was after using mplayer to play a dvd. Perhaps dvd playing programs somehow > unlock the dvd rom and leave it in that state?
It might be a region code thing; some DVD drives let you change it a certain number of times before it locks in place. I'd say mplayer knows how to do this, while the kernel does not. RANT: The whole CSS/region-coding fiasco is more proof that letting greedy business people, marketroids or lawyers near any sort of technological development is a sure-fire way to ruin a cool idea (and, incidentally, further damage society in the quest for another buck). -rob
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