Toei Animation announced that more than one background musics of Dragon Ball Kai were suspected to infringe the copyrights of third parties. They have already replaced those musics with the original BGMs of Dragon Ball Z.
Toei Animation had assigned the music of Dragon Ball Kai to Yamamoto Kenji instead of Kikuchi Shunsuke. Yamamoto Kenji’s other musics have also been suspected to be plagiarized works. (ref. niconico video)
Source: Toei Animation (PDF file)
