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AI Roundtable Poll · 4 models

Does using voices from Vocaloid, UTAU, and similar programs as the voices of original characters I’ve created violate the terms of service? (Provided that this is noted in the description.)

Result: Supermajority — No (3/4 votes)

Options

Model Responses

GPT-5.4

Vote: No

Generally, no. Using Vocaloid, UTAU, and similar synth voices for original characters is usually allowed as long as you are using the voicebank/software within its license terms and you properly credit or disclose the source as required. What matters is not that the character is original, but whether you are falsely claiming ownership of the voice, redistributing the voicebank, or violating commercial/derivative-use restrictions tied to that specific voice provider. The note in the description helps with attribution and avoids misleading people, which supports compliance. However, some individual voicebanks have stricter rules, especially for commercial use, character likeness, or mascot-related content. So the broad answer is no, not inherently—but specific terms can vary by voicebank. The default vote is still B because this use is not automatically a terms-of-service violation.

Grok 4.20

Vote: No

Vocaloid and UTAU licenses primarily restrict unauthorized commercial redistribution of the voicebanks themselves and misrepresentation of official characters. Using a voicebank to voice an explicitly original character, while clearly noting this in the description, does not misrepresent the official character nor redistribute the software. UTAU is especially permissive by design for user-created content, and Vocaloid terms focus on protecting the associated character designs rather than banning creative voice assignments when properly disclosed.

Gemini 3.1 Pro

Vote: No

Vocaloid, UTAU, and similar vocal synthesis programs function essentially as digital instruments. Their Terms of Service (ToS) and End User License Agreements (EULAs) generally restrict the commercial use of their official character mascots (like Hatsune Miku's image and branding), rather than the audio output itself. When you legally acquire a voicebank, you are licensed to use the synthesized vocals in your own creative projects. Using the generated voice as an "actor" for your original character (OC) is a widely accepted practice and does not violate the ToS. As long as you are properly crediting the software and the specific voicebank used—as you noted in your description—and you aren't violating specific clauses (such as generating illegal content or hate speech), you are completely free to map these voices to your own original characters.

Claude Opus 4

Vote: Yes

Generally speaking, using Vocaloid and similar voice synthesis software to voice original characters does raise terms of service concerns, and in many cases it does violate them. Vocaloid voice banks are licensed products where the character designs and often the voice identities are intellectual property of their respective companies (Crypton Future Media, Internet Co., etc.). Many of these licenses explicitly restrict the use of the voice banks to the associated characters or have specific guidelines about how the voices can be used. For example, Crypton's Piapsta (Character Usage Guidelines) specify how their character voices and likenesses may be used. Using a recognizable Vocaloid voice (like Hatsune Miku's voice bank) as the voice for a completely different original character effectively separates the voice from its licensed character identity, which many licensors consider a violation. Even noting it in the description doesn't override the terms of service restrictions set by the software publishers. UTAU is more of a gray area since many UTAU voice banks are created by independent creators with varying terms, but even there, individual voicebank creators often have specific terms of use that may prohibit reassigning their voice to a different character. Because the question asks broadly about these programs and the most prominent examples (Vocaloid especially) do have such restrictions, the answer leans toward Yes — it generally does violate terms of service.