You are welcome to view, download, copy or modify the original material of Nageki Tsutsu however, you MUST reference the original author if you deciede to share it in any form. If you deciede to share it, you also must make available the source code (musically notated scores). This licence applies for both commercial and non-commercial usage.
If you do fork/edit any of my scores, please do send me a link to it at contact@brinsleymorrison.com as I'd love to have a look!