How to descramble damaged DVD image file

[g_ml]

Hi,

normally, the css descrambling takes place when the data is read from the drive;
Is there any way to descramble an ISO image on hard disk?

I have a damaged disk that in this shape is no fun to watch anymore.
Copying the disk with dvd doesn't work too well, so I copied whatever is still
readable using ddrescue. The result is of course not a valid video DVD
anymore (unreadable sectors are replaced by 0s), but many players
could still play the video.

Unfortunately, when the data is rescued that way, it is still CSS scrambled.
I can't find any program (or at least not on Linux) to descramble a disk file.
Can it be done at all? Does anybody know of a suitable Linux application?

[Guest]

I don't know Linux well so I'll simply suggest that you burn the ISO back to a disk and rip that.

[setarip_old]

@g_ml

Hi!

Click on the following link to a thread in the Doom9 Linux sub-forum:

http://forum.doom9.org/showthread.php?p=1291190#post1291190

[g_ml]

... maybe my question was not clear enough:
I am not concerned about unscrambling DVDs in general (I know how to do that) but about occasions, where "normal" ways fail because the original DVD is too damaged. Not only on linux but also on windows (at least the few programs that I know of), most programs expect to read data directly from a disk drive (e.g. DVDdecrypter) or at least from an ISO image (dvdshrink). In any case, they expect a valid file system and dvdnav structures, which won't be the case if the DVD has a scratch at the wrong place. I am looking for a program that just reads a disk file, decrypts it where possible and writes it back to disk.

[setarip_old]

Try ISOPuzzle...

[Ghitulescu]

I don't know Linux well so I'll simply suggest that you burn the ISO back to a disk and rip that.

I'm not sure it'll work, due to CSS.

I would mount the image then rip the movie from this virtual drive. - the answer to your first question.
Of course, only after the original DVD being correctly read out with tools like IsoPuzzle or IsoBuster (both under Windows, I know no equivalent for Linux). - the answer to your second problem (damaged disks).

The best readers for damaged original DVDs still remain the LG burners, if possible get a lower speed one (like 4x, 8x - GSA4040 or similar). Then come the LiteOn burners, the BTC ones and so on. Pioneer readers are ok, so Toshibas.
You should also take into account that sometimes a DVD can be damaged beyond repair.