The music industry is buzzing with the news that high-resolution DVD-Audio content can be ripped, bypassing most of the format’s copy-protection safeguards. A small suite of applications that patch InterVideo’s WinDVD 5, 6 or 7 program allow data to be routed directly to .WAV files on the user’s hard-disk, instead of to a soundcard for digital-to-analogue conversion.
The three utilities are:
DVD-A Ripper, which is intended to decrypt CPPM protected AOB and VOB files, PPCM Ripper, used to capture Packed PCM (MLP) streams (stereo or multi-channel) to .WAV files and DVD-A Explorer which allows the user to browse a DVD-Audio track structure.
The applications use WinDVD’s licensed DVD-Audio and MLP decoders to access the unprotected data, which can then be freely shared. The only caveat is that DVD-Audio’s Verance digital watermarking, embedded in the audio signal itself, cannot be removed. The Verance watermark contains seventy-two bits of data comprising four CCI (copy control information) bits and eight usage identifier bits every fifteen seconds plus sixty content identifier bits every thirty seconds – if a DVD-Audio player detects that an embedded watermark does not match that of a specific disc (in other words if ripped DVD-Audio content is burnt to a blank DVD-R disc using an authoring program such as DiscWelder BRONZE), the machine will halt playback after thirty seconds.
Source: High Fdelity Review