Re: [ProgSoc] I want my MP3...

[Telford Tendys <telford@nospam.progsoc.uts.edu.au>]

> Is this going to stop direct duplication of cd's anyway?? after all if you
> copy the encrypted data from one cd to another, isnt it going to decrypt
> the same way?
> 
> Even if there is something put on the cds that traditional burners cant
> burn, Im sure there are a lot of music producers that like to create cds
> of their work, and of course they will want to do the encryption thing as
> well, so encryption burners will come out as a result of the demand for
> them.

On the hub of most CDs is a barcode which is printed and which is unique.
You can read the barcode but cannot write it. Blank CDs also have their own
unique barcodes which are read-only. So you key the encryption to the
barcode and the player reads the barcode first, then decrypts the music.
If the barcode changes, the CD won't decrypt.

A successful copy requires you to decrypt the original and either
[1] recrypt it to match the new barcode or [2] output in normal CD
format without encryption. Option [2] will be ruled out if players
are designed to demand encrypted music, option [1] can be difficult if
the players contain a public-key system which requires a matching private
key. If anyone buys a player with this included then they are stupid
for buying such a crippled device.

> As for changing the standard, this is fairly easily done.

Not if it makes the player incompatible with existing collections.
People will stick with what they have.

> Go back 10-20 years.. everyone was buying record and cassette.
> 
> Now the record and cassette sections of record stores are very very small.

But people still have large existing collections, they will want to
play them. Also, CD was a jump ahead of other media in quality so
people wanted it, this will be a jump backwards.

	- Tel
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