On Wed, 2003-12-24 at 06:51, mathieu perrenoud wrote:
On Wednesday 24 December 2003 11.34, Paul Stear wrote:
Hi all,
A very merry xmas to all.
I bought my wife a couple of Cd's that I would like <grin> and didn't realise that they are copy protected but list that they can be played on a windows machine. I convert all my Cd's into MP3 using grip and listen to them on my linux box. Has anybody any info, tips, progs that will allow me to rip the Cd's? ( After Christmas of course) I had vowed never to buy any copy protected Cd's for this very reason. How do people who only have MP3 players get on with these corrupt Cd's.
you can try this:
""""
Copy-protection systems work by adding a corrupt data track to the outside edge of a CD. This track is ignored by common audio CD players but prevents copying, and sometimes playing, in the more sensitive PC CD drives.
By covering up a portion of the dividing line and outside track on the CD, without touching the last audio track, it is possible to fool the CD player into thinking that the extra corrupt data track does not exist. The marker pen line can easily be wiped away afterwards with a soft cloth.
A similar result was also obtained by sticking bits of a Post-It note along the edge of the CD, but this is not advised as the paper may come loose and damage the drive. """
(quoted from vnunet.com)
Not all copy protection schemes work like this. Sope throw checksum errors on the disk, so that a standard cd player won't notice (doesnt check, time is more important than accuracy), but cd-roms, which verify data read (accuracy is more important than time) fail.
hmmm ... I am not very familiar with copy protection methods used on audio CD's, but anyway this can be hardly true, because ...
audio data are written without CRC, and even without sector headers i.e one audio sector = 2352 bytes, and therefore "jitter" efect is very common on lot of CD drives (different data are received, if ripping the same song twice)
sector for data has 2048 bytes for data + 304 bytes for CRC and header
Radiohead's 'hail
to the theif' cd works like this. I can play some of it using xmms' cdread plugin, but I end up having to revert to analog cd playing to actually listen to the disc.
Now, one possible way to rip it is to not use the digital ripping of the disc, instead recording the cd-audio channel while playing (shouldnt be affected by volume settings methinks). Also, ripping the cd (probably at a low speed) without error checking and then have a nice, proper .iso. You could burn this for future cd use, or you could see if grip can rip from an .iso image.
-- [EMAIL PROTECTED] mailing list
