Touhou is, iirc, basically completely public domain. It's a gigantic, bizarre diaspora fueled entirely by dedicated fans.
Everybody who thinks that copyright is required should see the success of 2hu.
Everybody who thinks that copyright is required should see the success of 2hu.
Zun actually does have a semi-formal license/terms of use (it primarily bans commercial use but also quite a bit of other stuff, much of which I think goes ignored): http://touhou.wikia.com/wiki/Touhou_Wiki:Copyrights https://www.animenewsnetwork.com/news/2011-02-14/tohou-proje...
ZUN's blanket ban on commercial distribution makes it really difficult and expensive to legally obtain anything when the only distribution channels are specialized doujin stores -- it's still commercial, but the ones getting the profits are various middlemen and not the arrangers and performers.