Ah, the region story again.
Thing to note R/O is that every DVD player is built to play every region of DVD - then adjusted to prohibit the viewing of (usually) the five regions that the player is NOT sold in.
However, the greater mass of machines will have a "software hack" that you can try to program into your DVD by means of a specific series of button pushes on the remote control.
I've just made one of my players region free by turning the machine on, ensure no disc in the drive, close the drawer, enter a code to get a (usually invisible) setup menu then enter the number 1397. Job done.
You need to enter the specific make and model of the player into a google search and all will, usually, be revealed. What make is it?