Question edited for clarity.
It means the the car was imported from a different country. or that the DVD Player was bought in a different country to be retrofitted to a vehicle so that existing purchased DVDs can be played.
So, the car was originally bought in Mexico and sold in Canada. Only Mexican DVDs play.
or Car was bought in Canada, and the DVD Players was bought in Mexico so the Mexican family can play the DVDs they had at home.
It is called a Region Lock. Some are fixed, some can be changed once or twice.
https://www.google.com/search?q=2015+nissan+pathfinder+dvd+player+unlock+region+lock
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