Sony PCV-RZ44G - Vaio Desktop Computer User Manual page 391

DVD has a different region code and won't play
Some DVDs are encoded for playback only in certain regions. For example, a DVD that is region coded for Japan may not play back if
you are in the United States.
It is possible to change the region code on your PC , but this is not recommended.
To learn about changing the region code on your DVD drive, refer to the documentation that came with your computer.
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