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·
    1 个月前

    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.

      • Auli@lemmy.caEnglish
        3·
        1 个月前

        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·
        1 个月前

        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.

    • WarmApplePieShrek@lemmy.dbzer0.comEnglish
      1·
      1 个月前

      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.