An announcement on Diverse System's website states that they've halted their distributions of 'D16' and 'Dear, Mr.Wac' (
http://vgmdb.net/album/22606) on account of a warning sent to them by Konami Digital Entertainment for copyright infringement.
Sources:
http://diverse.jp/index.shtml
http://twitter.com/DiverseSystem/sta...66028924796928
http://twitter.com/DiverseSystem/sta...13772419555328