Sony Escalates Legal Battle Against Udio With New $4.5 Billion AI Music Copyright Lawsuit

Sony Music has significantly intensified its legal fight against AI music platform Udio, filing a new copyright infringement lawsuit that dramatically expands the scope of its claims and raises the company's potential financial exposure to an estimated $4.5 billion. The complaint, filed on July 20, marks the latest chapter in one of the music industry's most closely watched legal battles over the use of copyrighted recordings to train generative artificial intelligence models.

The new lawsuit builds upon Sony's original case against Udio, which was first filed in 2024 alongside Universal Music Group (UMG) and Warner Music Group (WMG). At the time, the three major record companies accused both Udio and competing AI music startup Suno of copying copyrighted sound recordings on an enormous scale to train their AI systems without obtaining permission or licensing agreements. The labels argued that the companies had unlawfully used their catalogs to develop commercial AI products capable of generating music that competes with human-created recordings.

While the three labels initially presented a united front, the legal landscape has changed considerably over the past year. Both UMG and Warner have since reached licensing agreements with Udio, effectively ending their litigation against the company. Those deals reportedly require Udio to develop a new AI model trained exclusively on properly licensed recordings while restricting AI-generated music to a controlled "walled garden" environment within its platform.

Warner also resolved its separate dispute with Suno, leaving Sony as the only major label still actively pursuing Udio in court. Sony and UMG, however, continue to maintain their lawsuits against Suno.

Sony's newly filed complaint vastly expands the number of recordings at the center of its claims. The original lawsuit identified 333 copyrighted sound recordings as examples of the alleged infringement. According to Sony, those songs represented only a small sample intended to illustrate a much broader pattern of unauthorized copying.

The company now alleges that more than 30,000 Sony-owned recordings were used without authorization during Udio's AI training process, increasing the potential statutory damages from approximately $50 million in the original complaint to as much as $4.5 billion.

According to the filing, Sony says it only discovered the true extent of the alleged infringement after gaining access to Udio's training data through the legal discovery process. The company claims the evidence revealed that thousands of its recordings had allegedly been copied from YouTube and incorporated into Udio's training dataset.

Sony argues that this newly uncovered information demonstrates that the original complaint represented only a "minuscule, illustrative fraction" of the copyrighted works it believes were unlawfully used by the AI company.

The filing also explains why Sony chose to initiate a second lawsuit instead of simply expanding its original case. Earlier this year, the company attempted to amend its existing complaint to include the additional recordings. Udio opposed the request, arguing that introducing tens of thousands of new works nearly two years into the litigation would significantly delay the proceedings and unfairly complicate the case.

Last month, a federal judge agreed with Udio, ruling that allowing such a substantial amendment would unduly prejudice the defendants and slow the resolution of the lawsuit. However, the judge also acknowledged that Sony remained free to pursue additional claims through a separate legal action, effectively paving the way for Monday's filing.

Beyond expanding its infringement allegations, Sony's complaint also addresses one of the central legal questions currently facing the AI industry: whether training artificial intelligence models on copyrighted works qualifies as fair use under U.S. copyright law.

Udio has consistently argued that its training methods are protected under the fair use doctrine because the technology transforms existing works into entirely new creative outputs. That argument has become a cornerstone of numerous AI copyright disputes currently moving through courts across the United States, with no definitive legal precedent yet established.

Sony directly challenges that position by focusing on one of the four statutory factors courts evaluate when determining fair use: whether the alleged infringement harms an existing or potential licensing market. The company argues that recent licensing agreements signed by Udio itself undermine its own legal defense. Sony points to Udio's licensing deals with Universal Music Group, Warner Music Group, Kobalt, Merlin, Believe, and the National Music Publishers' Association (NMPA) as evidence that a legitimate commercial market already exists for licensing copyrighted recordings for AI training purposes.

According to Sony, a company cannot simultaneously pay for licenses from some copyright holders while arguing in court that no licensing market exists for the same type of material. The complaint contends that Udio's business decisions effectively acknowledge the economic value of training licenses, weakening its fair use argument by demonstrating that copyright owners already have an established market for these rights.

Despite continuing its aggressive legal campaign, Sony emphasizes that it is not opposed to artificial intelligence as a technology. The lawsuit states that AI and human creators can coexist in a sustainable and complementary creative ecosystem, provided AI developers respect copyright law and compensate rights holders through established licensing agreements. Sony argues that innovation in AI should be built upon voluntary licensing rather than the unauthorized use of copyrighted works.

That position is consistent with Sony's broader business strategy. Rather than rejecting AI outright, the company has pursued partnerships with technology firms developing AI-powered music tools, provided those collaborations operate within licensed frameworks.

By continuing its lawsuit against Udio while simultaneously entering AI-related partnerships elsewhere, Sony is signaling that its dispute centers not on the existence of generative AI itself, but on how companies obtain the content used to build those systems.