The Kyoto District Court on Dec. 13 found Isamu Kaneko, developer of the popular "Winny" file-sharing program, guilty of assisting copyright violation and fined him ¥1.5 million ($12,814).

The case was the first in Japan in which a software developer was charged with facilitating copyright violation.

Kaneko, previously a researcher at Tokyo University, says he will appeal the court's decision.

Japanese authors society JASRAC estimates the total value of music files and other software currently available via Winny at some ¥9.5 billion ($81.2 million).