The Chinese have been known to pirate anything and everything when it comes to others intellectual property. That goes for software, hardware, and everything in between unfortunately. It is probably a case where Chinese manufacturers were putting full fledged copies of Yamaha's Style data into keyboards manufactured in China and selling them. Yamaha had to take swift action to protect its intellectual property from being used illegally and on a massive scale. This goes way beyond, for example, Yamaha keyboard users exchanging custom Styles with one another. We do it because we own a Yamaha keyboard and so do the people we want to share our custom styles with. And we are not trying to make a profit from it. OTOH, China is apparently trying to sell keyboards with unadulturated Yamaha Styles in them with the intention of not only making a profit but claiming that Yamaha's Styles are in fact their own property and not really Yamaha's at all. That's a no no in anybodies book, except maybe the Chinese.

Best,
Mike

PS: This is not intending to castigate all Chinese people. Only the ones to whom it pertains i.e. only those partaking in the illegal and erroneous activity.