We are having a DVD manufactured which will be distributed worldwide.
The question is, should it be NTSC only, or NTSC+PAL (double-sided)?
If only a tiny number of people would need the PAL version, it might be better to just have NTSC to avoid the problem of people putting it in upside down. Also, a one-sided disc is cheaper and will allow us to have a design on the other side.
I think that that map is of television standards or video tape standards - it's not about DVD standards, because there's no such thing as a SECAM DVD, is there?