[mythtv-users] Ripped DVD recordings have skips
robert.mcnamara at gmail.com
Wed Apr 8 19:53:36 UTC 2009
On Wed, Apr 8, 2009 at 12:48 PM, Allen Edwards
<allen.p.edwards at gmail.com> wrote:
> Why is it so hard to do a bit true copy from a DVD to a file without
> doing any decryption? This would not require any defeating of the
> encryption and would allow backup. It seems to me that you only need
> decryption to view a file. Obviously I am missing something.
Indeed. This is exactly how rip prevention is implemented in modern
disks. Bad sectors are introduced into the disk to prevent
bit-for-bit copying. As players follow a branching path established
by the index on the disk, they never encounter the bad sectors. But a
bit for bit copy will.
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