QUOTE(GL1zdA @ Aug 17 2004, 10:29 PM)
What about this: http://www.audiorevolution.com/news/0401/27.dvdaudio.shtml
It only deals with the Verance watermark. The CPPM and MLP remain encrypted.
Full Version: Ripping DVD Audio
It only deals with the Verance watermark. The CPPM and MLP remain encrypted.
but surely the CPPM and MLP issue has been resolved by dvdaripper and associated tools. The only problem outstanding is how to remove the watermarks from the extracted wave files so that they can be remastered, using something like discwelder Chrome, to give a disc which can be played on standalone players.
Has anyone produced a tool to implement the methods detailed in the paper by Felten et al.
Has anyone produced a tool to implement the methods detailed in the paper by Felten et al.
Now that DVD-Audio is rippable, I am also surprised nobody has come up with a watermark remover. Or fully cracked CPPM and/or MLP.
QUOTE(Kazuma @ Sep 10 2005, 06:42 AM)
Now that DVD-Audio is rippable, I am also surprised nobody has come up with a watermark remover. Or fully cracked CPPM and/or MLP.
What would be the use of "removing" the watermark ? If you want to you'd probably have to add more distortions again to make the Watermark unreadable. And you at least have to know how the extracting algorithm works to defeat the watermark. This information is kept a secret.
Besides, it's possible to embedd multiple watermarks with different shemes/keys into an audio signal. There will always be the possibility that an DVD-A producer switches to another watermarking algorithm or uses two or more at the same time. How are you gonna defeat that without knowledge about the watermarking algorithms and without adding to much distortions ?
Sebi
As watermarked discs won't play on standalone players, the available watermarking types much be frozen, as there would be no way to let a machine, say 3 or 4 years old, update the encryption types. Therefore there much be a finite set of traps to overcome. Also, one of the 'tests' that the challenge required was for the modified wave to be undistinguishable from the watermarked one - the 'golden ear' test - the methods used by Felten's group are not adding in any distortion which is audible to the human ear.
The watermark in question is a single one... the Verance Watermark. It was one of the samples tested in the HackSDMI challenge, that is why there was a big stir over that back when it happened.
QUOTE(schalti @ Dec 3 2003, 05:43)
There is a way to rip DVD-Audios AND SACDs now :-).
A swiss company developed a multichannel highresolution S/P-DIF output board for DVD-Audio/SACD players.
The DSD 1 Bit 2.8224 MHz signal of the SACD is converted to PCM 24 Bit 88.2 kHz.
The PCM on the DVD-Audio is output at its original resolution, up to 24 Bit 192 kHz.
Since the output board gets the signal from the inputs of the builtin DACs you can also use the surround decoder and have the DECODED DTS and AC3 one the outputs of this output board.
http://www.dvdupgrades.info/digital_audio.html
I know ripping DVD-Audio is a walk in the park these days but for SACDs is something like that still available? I tried googling and came up with this:
http://www.npcamerica.com/Audio%20DSD%20pr...nverters%20.htm
https://www.dvdupgrades.ch/digital_audio.html
Is this the same thing?
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