Artist permission was obtained by Ghakimx in September 2009. Blanket permission for free songs only. Proper accreditation in credits and RIGHT STUFF would like to be contacted once a song gets in game.
The reply is as follows :
初めまして、RIGHT STUFFの代表のKarasuと申します。 お返事遅くなりまして申し訳ありません。 楽曲の使用に関してですが、無償公開であればご自由にお使い頂いて構いません。 ただし、その際は公開部分にクレジットの明記をお願いします。 公開後ご連絡頂ければ幸いです。
Which can be translated to :
Nice to meet you, my name is Karasu and I'm the representative of RIGHT STUFF. Sorry for writing a late reply. About the usage of songs, free public songs released can be used without charge. However, please indicate in the credits. Contact after it has been made public is appreciated.