decrypting DVD images (i.e. bitwise copies of the DVD)

[spotter]

Does anyone know of software that can decrypt encrypted DVD images?

I know its possible, as vlc can play these images perfectly, but I can't seem to find software that will decrypt them, all the ones I've tried seem to assume that a DVD image is decrypted already (well, old school DVD Decrypter will let me rip individual VTS's if I mount the image manually, but I want to rip the entire DVD to make an unencrypted image I can store)

The reason I have encrypted images is that some of my DVDs were in bad shape so I used ddrescue to recover them, but this results in a copy w/ the CSS still in place.

thanks

[Ghitulescu]

If the presence of CSS is the only problem you have (:rolleyes:) use then DVD shrink. Or any other normal decrypter, then use mkisofs or equivalents to recreate the image, if you want an image.

[spotter]

I can tell you that dvdfab didn't work, neither using hte iso I created manually, nor with it mounted.

I just tried DVD Shrink, and it fails with it too. it's like it assumes the image is unencrypted so fails when parsing the mpeg stream, but as I said VLC plays it fine.

[ggtop]

Maybe you could tell us first how you created these images. Which software did you use?

[spotter]

"The reason I have encrypted images is that some of my DVDs were in bad shape so I used ddrescue to recover them, but this results in a copy w/ the CSS still in place."

[ggtop]

Hupps, sorry.
the reason Fab or any ripper don't work could be that the VM (VideoManager) is broken due to the bad state of your disc. But it is very unlikely that everything is broken.
Maybe you could try to mount the image and then use DVDDecrypter in file mode to de-css the content. After that you should use PGCDemux to get the main movie or any other parts of the DVD. Try to create a new DVD with the content. You should also try to repair the mpeg stream with an special app. I read about VOB2MPG or PVAStrumento.

ggtop

[Ghitulescu]

Can you open the ISOs with WinRAR?
Anyway, burning DVDRWs might solve the problem. Actually I never had this issue myself, I always rip the physical DVD in the physical drive, but DVD shrink definitively can use mounted ISOs. Try also the old SmartRipper on that image, older tools are sometimes better ...

But these work only the CSS is the only problem, and not the other protections. Therefore the question: are you sure CSS is still there? The reason being that dd cannot read CSS protected sectors unless the drive authenticated the DVD which dd cannot do. In other words, you either have the deCSSed content of the DVD or you'll end with error messages and no ISO.

[setarip_old]

@spotter

Hi!

Click on the following for a post that appears to specifically address your needs (Read the ENTIRE post)...

http://forum.doom9.org/showpost.php?p=1144994&postcount=1

[ggtop]

So your tip is to do nothing or will you append the link :) ???

[spotter]

Well, going to try what setarip_old mentioned, but I know there's CSS in the image, as libdvdcss sees it and is able to crack it.

I also know that dvd shrink says there's no encryption (And for the VTS's that this is true, say the copyright warning), it works fine but for any other VTS that libdvdcss sees and cracks I just get green.

[spotter]

@setarip_old, so I couldn't manage to get dvd decrypter to work as mentioned in that post, but I found dvdbackup (http://dvdbackup.sourceforge.net/) which appears to have worked (but not at home, so can't test). Though, IIRC correctly, it breaks some disks other protection methods (i.e. it makes the DVD any region which breaks some DVDs

[dirio49]

if you have anydvd, there is a setting to force css(debug registry value "ForceCSS" if my memory serves right
You can try it (DWORD, set it to 1, restart AnyDVD)) cracking (assuming you mount the iso).
i think there might be a setting for DVD Decrypter not sure.

[mousemurder]

this usually works for me:lsdvd /path/to/iso && ddrescue --no-split --verbose --block-size=2048 /path/to/input.iso /path/to/output-decss.iso

the lsdvd calls libdvdcss and allows the ddrescue to produce a decss'd iso.

[mocham]

this usually works for me:lsdvd /path/to/iso && ddrescue --no-split --verbose --block-size=2048 /path/to/input.iso /path/to/output-decss.iso

the lsdvd calls libdvdcss and allows the ddrescue to produce a decss'd iso.


I just tried this on a disc that DVDfab wouldn't take (in Wine) and it appeared to work. I'll watch the entire movie later and verify for certain.

[spotter]

so lsdvd && ddrescue "Works" for me in drives where I have to authenticate the disk. However, it still rips a disk with what appears to be css still in place. (i.e. vlc can play it, but it logs using libdecss to cracks the keys) and when I mount the iso directly and try to play it in media player classic hc, it plays the menus find (unencrypted) but fails on the actual content)

[Ghitulescu]

I still am of the opinion that you have a structural protection (or maybe a bad angle removal etc.) there, not a CSS encryption. Once you authenticate the DVD, its content should be "freed" (provided you used libdvdcss, which was most probably used, or you couldn't have the DVD authenticated). Only a minority of sectors are actually CSS-scrambled, so MPC HC has no reason to fail.

I would rerip the originals again, maybe in wine, maybe windows native. So far I never found a DVD (in DE) that I cannot rip the main movie with the so-old-now DVD Shrink (sometimes a bit of PGCedit/vobblanker was needed to remove the 10kB cells that caused the problems).

[spotter]

so I couldn't get the cmd line listed in http://forum.doom9.org/showthread.php?p=1408577#post1408577 to work

BUT, taking my images, mounting them and having dvd decrypter work in iso mode via the gui, does work. it even pops up a dialog

"Encryption Detected!

File: VTS_01_0.VOB
LBA: 1173
The disc is not supposed tob e protected by CSS/cPPM sothis is somewhat strange!

Would you like to try and decryp the encrypted data?

<options>"

when I do this, it pops out an iso that works great.

I don't understand how an authenticating the disk should decrypt it. dd/ddrescue can definitely not do encryption, they just do bit copies

in fact, http://en.wikipedia.org/wiki/Content_Scramble_System seems to prove my point

yes, you need to authenticate to read the disk, but the titles will still be encrypted.

[setarip_old]

taking my images, mounting them and having dvd decrypter work in iso mode via the gui, does work.Glad to hear that DVD Decrypter did, in fact, work for you ;>}

[Ghitulescu]

I don't understand how an authenticating the disk should decrypt it. dd/ddrescue can definitely not do encryption, they just do bit copies

in fact, http://en.wikipedia.org/wiki/Content_Scramble_System seems to prove my point

yes, you need to authenticate to read the disk, but the titles will still be encrypted.
I didn't know exactly which way you actually did copy the DVD (which scripts and dependencies used) because normally you should have obtained a deCSSed disk, but in the end I'm glad you solved the problem.

[spotter]

Glad to hear that DVD Decrypter did, in fact, work for you ;>}

yea, I knew dvd decrypter worked (as in orig post), but never used its rip to iso function b4.

[mocham]

I tried the method mentioned in post 13 (http://forum.doom9.org/showpost.php?p=1410971&postcount=13) on a disc that DVDFab and mplayer both failed on, and I can confirm that this method using lsdvd and ddrescue does not remove the CSS protection as spotter also confirmed. The resulting iso when run with VLC or mplayer showed CSS keys being decrypted for each title.

[Ghitulescu]

Normally it should do. Ask its developer acid_kewpie@users.sourceforge.net whether there's any problems related to his software (and your disk).

[spotter]

Ghitulescu, there's no way it can. All it can do is authenticate the disk. Authenticating the disk is only one part of the decryption process.

[mousemurder]

Normally it should do. Ask its developer acid_kewpie@users.sourceforge.net whether there's any problems related to his software (and your disk).

a little birdie tells me that acid_kewpie no longer maintains that so contacting him wouldnt yeild a response.

[spotter]

so, decided to implement something on my own, seems to work, though no promises, as its a very naive (simple might be a nicer word) program.

http://forum.doom9.org/showthread.php?p=1451182#post1451182