There is no simple way to do this, you have to re-author the DVD if you want to retain the original menus and features. The video may or may not have to be re-encoded depending on the frame rate of the original. It is possible to change the pulldown flag so that it will play on an NTSC player without a re-encode.
Unless you are familiar with DVD authoring or can find an NTSC version of the disc, you're out of luck. Get a player that plays both formats and is region free, or play it on a computer after the DVD has been decrypted.
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