Most DVDs are only differentiated regionally by a code.
Try putting the make and model of your DVD player and the word "hack" into Google and see what comes up.
Did this on ours and all that was required was opening the disc drawer, entering a 6 digit code and then closing it. Can now play US DVDs no bother, but not tried any "Asian" ones.
However, if you don't want to "disturb" them with the contents of the DVD, I have never heard of any reginoionally restricted DVDs not working on any PC that plays DVD