 Designing DVD player trick plays (PDF)
Trick plays provide the hallmark of an advanced DVD player. In your next DVD player design, it is important to consider the efficient interaction of your local interface drive, decoder circuitry, and navigation software.
Webopedia Quick Reference: DVD Regional (Country) Codes
DVD movies are usually coded with what is called a country or regional code or a zone lock. The three names, however, mean the same thing. DVD movies are given a regional code and the code on the DVD movie must match that of the DVD player to be viewed.
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