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Because R4 cards allow users to easily pirate Nintendo DS games and other software, they are illegal in the United Kingdom. The R4 chip, which is made in China where software piracy runs rampant, has also been banned from retail sale in Japan.
Source:
Intent Media: Japan: R4 Cards Banned
Times Online: The R4 Chip is Only Small - But it Looks Like a Giant Pirate to Nintendo
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