Cannot watch DVD from China on California

Hi all, I am a newbie here.

Dumb question No.1:
What is the best software for making a backup DVD brought in my China trip last month?
I have a NEC DVD+RW drive on my PC – watch the dvd is ok.
But I got “cannot play” from Sony DVP-725P DVD player on my Home Theater System.

Thank in advance.
I live in Calif.

i’ll assume it’s either dvd-9 or dvd-5. either way you need to remove region protection. many ways to do this during the copying process. many programs available to do it too. try
my guide/s