Over the years, a number of anonymous wuxia writers have written, published, and sold a number of Jin Yong novel "prequels" and "sequels" (i.e. for LOCH) under Jin Yong's name (or variations thereof). Often, these novels are packaged exactly like the real thing and even sold in Chinese bookstores side by side with real Jin Yong novels.
These pseudo-Jin Yongs have taken Jin Yong's basic ideas and expanded upon them in ways the original author never intended. Sometimes, their ideas are quite ludicrous (even more so than the TV adaptations in some cases). More likely than not, Jin Yong does not approve of or sanction these.
The question is, why hasn't Jin Yong taken legal action to get these authors and their publishers to stop distributing these books? I don't know how copyright laws in the relevant Asian countries (most likely, Hong Kong, Taiwan, and China) work, but surely there must be some laws governing intellectual property rights. These books have been on the shelves for years, and Jin Yong has apparently tolerated them. Why?