You will notice on some DVD sale pages it says "region #" somewhere on the page. You should be able to find information about this on Amazon.com.
Basically, different parts of the world get different DVD releases. North America is Region 1, Europe and Japan are region 2, Australia is 4, China is 6, and some other countries and areas share these regions.
http://hometheater.about.com/cs/dvdlaserdisc/a/aaregioncodesa.htm
explains it in more detail.
If you have a DVD-ROM drive on your computer you can switch regions, but each computer allows the region-swapping a set number of times, so while it's a good idea if you take your computer to a different continent for a year and rent a lot of movies there, it's not a good idea if you watch movies from two different regions a lot (IE, you don't want to do frequent region switching, so it really isn't practical to do it just for a single DVD, unless you plan to do something like have a laptop computer that ONLY plays dvds from a region not your own).
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