[gentoo-user] Copying encrypted files from a DVD

[Grant]

I'd like to back up the files on my DVD-Audio discs.  The files are
encrypted and I don't want to decrypt them, I just want to back them
up.  I'm getting I/O errors when I try to cp the files, and I'm
guessing it's because of the encryption.  Does anyone know of a method
that would back these discs up in their encrypted form?  Here are the
errors I get:

# cp -R /mnt/cdrom/AUDIO_TS DVD-A
cp: reading `/mnt/cdrom/AUDIO_TS/ATS_01_1.AOB': Input/output error
cp: reading `/mnt/cdrom/AUDIO_TS/ATS_01_2.AOB': Input/output error
cp: reading `/mnt/cdrom/AUDIO_TS/ATS_01_3.AOB': Input/output error
cp: reading `/mnt/cdrom/AUDIO_TS/ATS_01_4.AOB': Input/output error
cp: reading `/mnt/cdrom/AUDIO_TS/AUDIO_SV.VOB': Input/output error
cp: reading `/mnt/cdrom/AUDIO_TS/AUDIO_TS.VOB': Input/output error

- Grant