[mythtv-users] Ripped DVD recordings have skips

Allen Edwards allen.p.edwards at gmail.com
Wed Apr 8 20:02:55 UTC 2009


On Wed, Apr 8, 2009 at 12:53 PM, Robert McNamara
<robert.mcnamara at gmail.com> wrote:
> 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.
>
> Robert
>


So why can't you read one sector at a time and write the good ones and
write blanks where there were bad ones?  Again, I am missing
something.

Allen


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