Japan Court Recognizes Legal Protection for Human Voices in AI Clone Case

A Tokyo court has recognized that a person’s voice can receive legal protection, in a landmark case involving Japanese voice actor Kenjiro Tsuda and the unauthorized use of an artificial intelligence-generated imitation of his distinctive voice.

The Tokyo District Court issued its decision on September 30, marking the first time a Japanese court has recognized a person’s voice as something that can be protected under publicity rights.

A voice copied without permission

Tsuda, known for his deep voice and roles including Kento Nanami in the popular anime series Jujutsu Kaisen, brought the case after a TikTok account used an AI-generated voice that he said closely imitated his own.

The account reportedly published more than 180 videos featuring narration about urban legends and paranormal subjects. Tsuda argued that his distinctive voice was being used without his permission and sought the removal of the videos.

The case attracted attention because the voice was not simply a recording of Tsuda. Instead, the dispute involved technology capable of generating new speech that sounded like a particular person’s voice.

The court’s decision

Presiding Judge Aya Takahashi said that a human voice can be a symbol of an individual’s personality in much the same way as a person’s image.

The court recognized that unauthorized use of a performer’s voice for commercial purposes can potentially infringe publicity rights. However, Tsuda’s request to have the videos removed was dismissed because the videos had already been deleted before the judgment.

The ruling therefore did not order TikTok to remove the disputed material, but it established an important legal principle concerning the protection of voices.

Why the case matters to voice actors

Voice actors have become increasingly concerned about AI systems that can reproduce distinctive voices from relatively small amounts of recorded speech.

For performers whose careers depend on their voices, unauthorized AI imitation can raise questions about consent, commercial use and control over their professional identity.

The Tokyo ruling does not prevent all forms of AI-generated speech. Instead, it establishes that a person’s voice can have legal significance when its distinctive qualities are commercially exploited without permission.

A new question in the age of AI

The case reflects a wider question emerging as artificial intelligence becomes increasingly capable of reproducing human characteristics.

A face can already be recognized as part of someone’s identity, but voices are also deeply associated with particular people. Actors, singers, broadcasters and other performers can become recognizable partly because of the sound of their voices.

Tsuda’s case shows that courts are now beginning to consider how existing legal protections should apply when technology can reproduce that identity digitally.

As AI voice generation continues to develop, the Tokyo decision could become an important reference point for performers seeking control over how their voices are used.

Sources: Associated Press, Jiji Press, The Japan Times.