Witchcraft Wars Trilogy, a series of novels by a little known Australian author, have recieved quite a bit of attention on forums and social medial recently as it turns out that many of the names used in the series are IP owned by Wizards of the Coast. Early speculation that the author had obtained legal permission to place her novels in the Mystara Setting was rejected when the author herself claimed never even having heard of Mystara.
Although the setting of this series of novels is called the Kingdoms of Kaynos and feature an original story by the author, realms in this world are called things like:
Glantri, The Heldann Freeholds, The Duchy of Karameikos and Vestland. Furthermore there is a city called Zeaburg and another character called Thincol Torion. Many of these names date back to the first appearance of the Mystara setting back in 1981. Furthermore art work and maps appearing in the novels replicate that from published RPG books as demonstrated on Tim Brannan's Blog.
Understandably this has upset authors who worked with the setting for TSR over the years, including Mystara Guru Bruce Heard, as well as Dragonlance creator Tracy Hickman who adressed the issue over at his blog, explaining why even he is now no longer allowed to publish new Dragonlance fiction. Paying homage is one thing, but at one point the line is crossed.
The situation has been reported to WotC, so presumably the matter will be resolved soon.
Illustration by Bruce Heard.