Though I don't know details on why they are pissed or at whom specifically. And I don't want to talk about sensitive stuff like this, if I really don't know for certain. With their latest model being called "Copy my Ass", you can be fairly sure that they are pissed at someone though

Then of course there always is this, too...
MiniMX, 2007~2008

Noppoo Choc, 2010

*COUGH*

Also, they were extremely unpleased when some guys took the AIKON and had it mass produced and slapped a "(C) KBC" onto the PCB and sold it commercially on Taobao, even including the original OTD software.