Koei Tecmo Games filed a lawsuit against YOUZU for copyright infringement. Due to repeated unauthorized use of "Nobunaga's Ambition" and "Taiko Ryushiden" music, game screens, etc.

Koei Tecmo Games filed a lawsuit against YOUZU for copyright infringement. Due to repeated unauthorized use of "Nobunaga's Ambition" and "Taiko Ryushiden" music, game screens, etc.
KOEI TECMO GAMES IS A SUBSIDIARY OF YOUZU (SINGAPORE) PTE. LTD. announced that it has filed a lawsuit in the Tokyo District Court seeking an injunction against acts such as copyright infringement and compensation for damages arising from such acts....

The linked article is in Japanese.