On Wed, 2005-01-12 at 08:47, Martin Deppe wrote:

Dan Am wrote:

Well, if a CD/DVD is copyprotected it isn't as easy as you obviously think it is.

Try to copy an encrypted Video-CD/DVD this way and you'll see, that even that doesn't work this way. It takes the decoder and in his case it is similiar.

Martin P.S. even though he might be lucky to anyways be able doing it your way but I doubt it.

To experiment without actually burning a cd copy the cd using dd to a file and then try to mount the ISO using -o loop to the mount command. I don't have a copy protected cd to try this with. -- Ken Schneider UNIX since 1989 SuSE since 1998 * Only reply to the list please*

* Dan Am (Wed, Jan 12, 2005 at 03:04:26PM +0100)

...

Try to copy an encrypted Video-CD/DVD this way and you'll see, that even that doesn't work this way. It takes the decoder and in his case it is similiar. But how could that possibly be ?? The problem just cannot be with

Am Mittwoch 12 Januar 2005 14:47 schrieb Martin Deppe: dd given the way it works. Must be something with the recording. I don't have this kind of DVD so I cannot try it out just now. How about something like dd if=game.iso| cdrecord -options - Might that might work ?

Copying DVDs that are Deccs encrypted , and copying most game CDs is indeed simply a matter of dd if=... of=... However some DVDs/CDs are deliberately not iso9660 standard compliant, and in that case dd will fail. Currently listening to: nirvana1991-12-31d1t22 Gerhard, == The Acoustic Motorbiker == -- __O The complete works of William Shakespeare, adapted for this =`\<, signature by nailing them to a piece of wood, and banging it (=)/(=) repeatedly on the keyboard ,km, nmvbnmfcvvfgjehyfty7t4690iu8p-oilpm/l;.k, ,.mnnmbvvbchfdtgr5rt4es

to add another 2cents to the mix one of the copy protections for cd's was to make it impossible (physically) for the CDwriter to write the data. Could be read fine, just not re-written. What they did was took advantage of the cdwriters firmware programming. The firmware was written to optimise the way data is written to the blank to get as fast a write a possible, I don't remember the exact specs so, please don't be anal, just listen to the concept. Something to the effect of using 14bit chunks or something like that. So, all that was needed was to organize the bits in 15 bit chunks that made it impossible for the drive to change to 14 bit. I remember reading about this on the clonecd site where it listed each drive models ability to deal with this particular encoding. So, once the protection became popular, the newer drives were made without the ability to do this. I remember that Plextors were mostly able to do this. anyway, B-) On Wednesday 12 January 2005 10:09 am, Carlos E. R. wrote:

The Wednesday 2005-01-12 at 15:16 +0100, Gerhard den Hollander wrote:

...

Copying DVDs that are Deccs encrypted , and copying most game CDs is indeed simply a matter of dd if=... of=...

However some DVDs/CDs are deliberately not iso9660 standard compliant, and in that case dd will fail.

At the beginning of the PC times, floppies were copy protected by, for example, burning a hole with a laser, and thus producing an error on a certain sector. Another way was to record a sector with weak magnetization. But we had a program (Copyrite, I think) that was able to detect and simulate those errors in the backup copies. It worked well with the PC, but I had no look with the AT types (higher density, perhaps, or tricked drives, dunno.

There might be something equivalent nowdays.

Note: if someone thinks that it might be illegal, the Copyrite people were sued, and they won: users have the right to make backup copies. After the trial, copy protection schemes almost disappeared. Almost :-/

-- Cheers, Carlos Robinson

On Thu, 13 Jan 2005 01:16 am, Gerhard den Hollander wrote:

* Dan Am (Wed, Jan 12, 2005 at 03:04:26PM +0100)

...

Am Mittwoch 12 Januar 2005 14:47 schrieb Martin Deppe:

...

Try to copy an encrypted Video-CD/DVD this way and you'll see, that even that doesn't work this way. It takes the decoder and in his case it is similiar.

On the Mac there is a program called DVDbackup that decrypts, de-regionalises DVDs and records to HD. Once it's run you can play the movie off your HD. If you just copy CSS encrypted files, you need decoding hardware in the DVD drive to read them.

...

But how could that possibly be ?? The problem just cannot be with dd given the way it works. Must be something with the recording. I don't have this kind of DVD so I cannot try it out just now. How about something like dd if=game.iso| cdrecord -options - Might that might work ?

Copying DVDs that are Deccs encrypted , and copying most game CDs is indeed simply a matter of dd if=... of=...

However some DVDs/CDs are deliberately not iso9660 standard compliant, and in that case dd will fail. Some CDs have a visible thin outer track that upset some drives, you just hear the heads swinging to and fro. These can be made standards compliant by running a whiteboard marker around the outer edge. Obscure the "bonus" track and the CD becomes visible.

michaelj