[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
More information about the mythtv-users
mailing list