Kenton A. Hoover wrote:
>That would require a firmware change to the CD-ROM drive. Their technique
is
>quite clever -- they're inserting CRC errors deliberately, which the
>CD-ROM units will fix when the data is copied, rendering the copy
>inaccurate and unusable.
If they introduce CRC errors, then any unit that is meant to make
corrections based on these CRCs will produce incorrect data. This includes
hifi CD players, which will pass incorrect information to their DACs. As
far as I can see, there is no way to cause a CD player to play audio without
passing the exact data that its DAC is converting to its digital output.
Also, A CD-ROM drive playing CD-DA is performing exactly the same
reading/error correction etc. as a CD player is, so it would have to decide
that a data disc had been inserted in order to be tricked into not playing.
If a disc is flagged as data, then most CD players will not play it at all.
How can CRCs be manipulated to make a CD-ROM drive think it is reading a
data disc, but a CD player still play it correctly as audio? I don't think
it is possible. It might be possible to stop a CD-ROM ripping from a CD-DA
disc, but simply playing it? Nope.
-cb
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