I want to create a bit-by-bit backup of my DVD and a Blu-ray disc without removing its encryption. Is dd be the best method, and if so, what flags or settings should I use? Also, is comparing the SHA-256 hash of the generated ISO file with the hash of the original disc’s raw data (read from /dev/sr0) the best method for verifying the backup’s integrity?

  • ten8tp@reddthat.comEnglish
    2·
    2 days ago

    If so this is clever. In the wild event they get into some sort of trouble with copying, they have a bit-for-bit copy proving they own/owned the BluRay instead of a ripped copy.

    • WarmApplePieShrek@lemmy.dbzer0.comEnglish
      1·
      11 hours ago

      There are layers below the bits. Writable CDs are made from different chemicals, so it’s obvious they are copies. Heck, some of them are obviously different colours, like blue.

      • Auli@lemmy.caEnglish
        3·
        13 hours ago

        But what is the point. You have to break the MA to watch it. If you even can. You can’t make 1 to 1 copy because if you could we wouldn’t have had to break the encyprion.

      • ten8tp@reddthat.comEnglish
        1·
        15 hours ago

        A digital or physical copy of a receipt. But then how would they know the receipt is theirs? Well, they don’t. There are a subset of users who have bit for but copies. I think if they came into some legal trouble having that vs a rip would be better since the data is in tact the same way it was when purchased. Can I easily be called a backup.

        I’m not your lawyer and I’m definitely not a lawyer anyway. Just playing Devis Advocate.