Vocaloid Legal Implications

According to Crypton, because professional female singers refused to provide voice samples, in fear that the software might create their singing voice's clones, Crypton changed their focus from imitating certain singers to creating characteristic vocals. This change of focus led to sampling vocals of voice actors and the Japanese voice actor agency Arts Vision supported the development. Similar concerns are expressed throughout the other studios using Vocaloid, with Zero-G refusing to release the names of their providers and Miriam Stockley (who provided the voice for Miriam) remains the only known Zero-G voice provider. PowerFX only hinted at Sweet Ann's voice provider and only Big Al's is known. AH Software named Miki's voice provider, but for legal reasons cannot name Kaai Yuki's as minors were the subject of the recordings.

Any rights or obligations arising from the vocals created by the software belong to the software user. Just like any music synthesizer, the software is treated as a musical instrument and the vocals as sound. Under the term of license, the mascots for the software can be used to create vocals for commercial or non-commercial use as long as the vocals do not offend public policy. In other words, the user is bound under the term of license of the software not to synthesize derogatory or disturbing lyrics. On the other hand, copyrights to the mascot image and name belong to their respective studios. Under the term of license, a user cannot commercially distribute a vocal as a song sung by the character, nor use the mascot image on commercial products, without the consent of the studio who owns them.

One of the most controversial uses of the legal agreements of any Vocaloid producing studio was from the Democratic Party of Japan, whose running candidate, Kenzo Fujisue, attempted to secure the use of Miku's image in the Japanese House of Councillors election of July 11, 2010. The hope was that the party could use her image to appeal to younger voters. Although Crypton Future Media rejected the party's use of her image or name for political purposes, Fujisue released the song "We Are the One" using her voice but not credited to her on YouTube, by replacing her image with the party's character in the music video.

Employees working within the studios are bound by legal implications not to repeat any details given to them from Yamaha on Vocaloid development without Yamaha's permission. They are also not allowed to disclose details of upcoming Vocaloids without permission of the Vocaloid studio nor reveal the identity of the singer if the studio does not make it public.

On November 29, 2010, Crypton started an independent music publication for seeking copyright royalties if songs are used for commercial purposes such as karaoke, because Vocaloid users hardly used the copyright collective Japanese Society for Rights of Authors, Composers and Publishers (JASRAC). Due to the fact songs using the software are made by independent users, the act of plagiarism has remained a highly controversial issue among Vocaloid users and their published works. This has been a heated issue on both illustrative and musical levels with songs and their publishers being targeted by allegations of stealing the works of others. In January 2011, Japanese boyband KAT-TUN were forced to admit plagiarism against their song "Never×Over~「-」Is Your Part~", after the producer of the song admitted it was influenced by the Vocaloid song "Dye" produced by AVTechNO, after fans expressed their outrage over the similarities of the two songs. However, AVTechNO also released a statement explaining that the members of the band were not to blame for this incident.