Hi,
I think that is COPY PROTECTED DVD. Even I have Original DVD of "When stranger calls" and can watch it in any home theater system, but my pc wont read it. I mean When we try to play in windows media player it says" copy protected cd" . When open the folder and tried to open "ifo" or "vop" files only some text and scrambles images played. I even tried to copy the DVD but could not.
more info *en.wikipedia.org/wiki/Copy_prevention
more info *club.cdfreaks.com/
Ok Now to play u can try some softwares like
dvd_to_dvd_copy_xpress - *freeware.filehungry.com/english/pr...io_tools/audio_editors/dvd_to_dvd_copy_xpress
I think this will solve your issue, by the way i dint tried any software yet as now only i am searched for the softwares.
Let me know if it works!!!!!