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Old 10th February 2007, 09:20   #87  |  Link
arnezami
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Join Date: Sep 2006
Posts: 390
Making a perfect (but encrypted) backup

I've got a related idea.

It just may be possible to create a perfect (but still encrypted) backup which is still playable. It would require re-encrypting the title key file and mac-ing it (with a new VUK) This new VUK would derive from the Volume ID of a re-writable (here lies the possible problem) and the unchanged Media Key (derived from the MKB).

To test if this even could work somebody with a HD DVD burner (and maybe a usb connected HD DVD drive) would have to try the following:

- Burn all (still encrypted) files to the new rewritable disc (do a bit-for-bit copy)
- Put it in a (preferably usb) HD DVD drive (and with usb turn on the sniffer) and start a software player (btw the movie won't play)
- See if the log contains a Volume ID (or if you don't have it usb connected and can't use the sniffer: if its in Jap WinDVD's memdump, see page 1 of this thread for instructions but leave out the 40 00 part like with Blu-Ray). If so it just might be possible...

Its entirely possible the disc is first somehow checked if its a pre-recorded one (eg. the drive missing the HRL in the lead-in area: or does the bit-for-bit copy that too? or something in the so called "system lead-in") which ends the story right away. But its worth a try I think.

arnezami

Last edited by arnezami; 10th February 2007 at 15:55.
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