Tokyo District Court: Japan Court Voice AI Publicity Rights Upheld

• A Tokyo court ruled that a human voice is legally protected in Japan under publicity rights, particularly when used for commercial appeal.
• The landmark decision stemmed from a lawsuit filed by anime voice actor Kenjiro Tsuda against TikTok over AI-generated voice clones.
• While the court affirmed voice protection, it dismissed Tsuda's request to remove the videos because the anonymous user had already taken them down.
• The case is considered Japan's first to defend an individual's vocal identity against AI-generated copies.
• The ruling highlights growing concerns among performers and the Japanese animation industry about unauthorized AI voice mimicry.

This landmark decision by the Tokyo District Court is considered Japan's first to explicitly state that a human voice is protected under publicity rights, especially when its utilization is solely intended to capitalize on its commercial allure.

The Tokyo District Court recently delivered a significant ruling, affirming that a human voice can receive legal protection in Japan. This decision emerged from a high-profile case initiated by Kenjiro Tsuda, a renowned 55-year-old anime voice actor celebrated for his roles in popular franchises such as "Jujutsu Kaisen" and "Yu-Gi-Oh!" Tsuda brought legal action against TikTok, alleging that videos hosted on the platform featured an artificial intelligence-generated imitation of his distinctive "lustrous" baritone voice.

The court's judgment, while a partial victory for Tsuda, established a crucial precedent regarding the protection of vocal identity against AI-generated copies. Aya Takahashi, who presided over the case, declared that the unauthorized use of a performer's voice could indeed constitute an infringement on their publicity rights. She is currently an Attorney-at-Law at Mimura and Komatsu Law Office, having joined in August 2024. This ruling marks what is believed to be Japan's inaugural judicial pronouncement specifically addressing the defense of an individual's vocal identity against AI replication, particularly when the voice is exploited for its commercial appeal.

This landmark decision by the Tokyo District Court is considered Japan's first to explicitly state that a human voice is protected under publicity rights, especially when its utilization is solely intended to capitalize on its commercial allure. Judge Takahashi articulated that a voice holds a symbolic significance to one's personality, akin to how portraits represent an individual. Publicity rights, in this context, empower individuals to control and derive financial benefit from the commercial exploitation of their personal attributes, including their unique vocal characteristics.

The ruling underscores a growing global concern among performers regarding AI imitation, a threat that has particularly unsettled Japan's esteemed animation industry. Voice actors, often revered by fans as much as the characters they portray, view their voices as the fundamental tool of their trade. This legal precedent provides a new avenue for human voice AI protection in Japan, offering a framework for performer rights against unauthorized AI voice cloning.

The legal dispute centered on numerous TikTok videos that featured a voice Tsuda identified as unmistakably his own, describing it as "deep" and "lustrous." TikTok, however, countered in court records that the voice was merely a "generic male voice," arguing that any perceived similarity to Tsuda's was subjective. The anonymous account responsible for the videos displayed a profile picture resembling a "Jujutsu Kaisen" character voiced by Tsuda and combined images with seemingly AI-generated narration on topics like urban legends, occult phenomena, and conspiracy theories.

At its peak, this account garnered over 200,000 followers and was estimated to generate more than 500,000 yen, or approximately $3,200, in monthly revenue, according to the legal complaint. Tsuda's legal team contended that the account's popularity stemmed directly from its "dubious, sordid content" being narrated by the "attractive voice of a popular actor." Despite the court's affirmation of voice protection, Tsuda's request for the removal of the videos was dismissed. This was because the anonymous user had already taken down the offending content several months after the lawsuit commenced, thereby absolving TikTok of any further obligation to delete them. Tsuda's lawyer, Takashi Hirano, observed that the ruling ultimately presented a scenario where "both sides look victorious." TikTok, for its part, stated it would "respect the court's judgment" and "scrutinize details" before determining its next steps, emphasizing its commitment to balancing technological advancement with rights protection.

The outcome of this case has garnered significant attention among Japan's voice acting community, who are increasingly apprehensive that AI mimicry of their craft could contribute to the industry's decline. Yuko Sasaki, the executive director of the Japan Actors Union and a fellow voice actor, highlighted the extensive effort involved in developing a professional voice. She explained that an actor's voice is the culmination of "years of rigorous training and apprenticeship," requiring substantial investment of both time and money to perfect. Sasaki expressed the union's full support for Tsuda's legal challenge.

In parallel with the lawsuit, Sasaki and other Japanese voice actors have launched a collective initiative named "No More." This campaign actively advocates against the use of generative AI to mimic performers' voices without explicit authorization, reflecting a broader industry-wide movement to safeguard creative control and intellectual property in the age of advanced artificial intelligence.

This landmark ruling in Japan establishes that a human voice can be protected under publicity rights against AI-generated copies, particularly when used for commercial appeal. Lawyers advising clients in AI development, entertainment, or content platforms should assess potential infringement risks and compliance requirements related to unauthorized voice mimicry in Japan.

Source: Original reporting via news agencies.