Audio stream unspecified

Hi .

I’ve dowloaded cloneDVD a couple of days ago.

I successfully copied a few of my DVD’s

There are 2 DVD’s which have an unspecified audio stream
when opening the DVD with anydvd and load into cloneDVD.

The type is specified like AC/3 with a number of channels but
it reports it as “unspecified”

And indeed when the backup finishes there is no sound.

When Trying to play in Power DVD it gives me an unsupported
audio format.

I have no clue what this is. Is the DVD audio stream scrambled encrypted ??!@??