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A hacker who breached Suno in November 2025 handed 404 Media the company's own scraping source code this week, and it names exactly where the AI music generator pulled its training audio from and how much it took. Nine source libraries are logged by the hour in the leaked files. Add every one of those numbers together, something none of the outlets that broke this story did, and you get 381,813 hours of audio. That is 43.6 years of continuous playback, and just under 70% of it traces back to YouTube alone.

The hacker used a supply chain attack in November 2025 to get an employee's credentials, then pulled source code dated 2023 and 2024 out of Suno's systems. They sat on it for months before sharing it with Jason Koebler at 404 Media, who published the Suno hack findings on July 15, 2026. Suno has spent two years telling courts it trained on "publicly available music files" under fair use. The leaked code does not settle the legal question, but it answers the question every reporter covering the lawsuits had been unable to pin down: which platforms, and how much.

The code's own comments list the sources it pulled from: genius_hq, youtube_music, freesound, jamendo, imp (the International Music Score Library Project), deezer, and ytm_tagged, with an instruction to filter out anything that wasn't music. A file tracking the youtube_music dataset recorded 2,013,545 individual music clips ingested. That works out to an average clip length of about three minutes and twenty-three seconds, which is roughly a full song, not a snippet.

Every outlet that covered the Suno hack, TechCrunch, Variety, Pitchfork, Gizmodo, Music Business Worldwide, ran the same nine hour-figures from the source code as a list. None of them added the list up. Doing that arithmetic is the whole point of a hack like this, so here is the total.

That total converts to 43.6 years of nonstop audio, pulled from nine separate catalogs. The two YouTube-labeled entries, youtube_music and ytm_tagged, together account for 266,041 hours on their own, 69.7% of everything logged. Every other source in the list, Deezer, Genius, Pond5, Jamendo, IMSLP, Freesound, and MuseScore combined, adds up to less than a third of what came from one platform. If Suno's fair-use defense stands or falls on how it acquired its training data, this is the arithmetic that argument now has to survive, and it puts a single company's platform at the center of it.

Separately, a report from industry newsletter AI Weekly cites the same Suno hack material describing roughly a million additional hours pulled from podcast RSS feeds across some 420,000 shows. That figure sits outside the nine-category breakdown above and I could not independently verify the exact count against a primary source, so treat it as a reported addition rather than confirmed math. Even without it, the confirmed total already runs past four decades of audio.

This is the part that matters more for the DMCA argument than the raw hour count. TechTimes, also citing the leaked source, reported that Suno's scraper routed requests through Bright Data, a commercial residential-proxy service, specifically to cycle through rotating IP addresses and get past YouTube's bot detection. That is a meaningfully different claim than "we downloaded public files." Bot detection exists because the platform does not want to be scraped at scale, and routing around it with rotating proxies is closer to what security researchers call active evasion than passive collection. The RIAA has argued for two years that Suno ripped songs directly from YouTube in violation of its terms of service and the DMCA's anti-circumvention provisions. The hacked code is the first piece of evidence that names the specific tooling used to do it.

Suno's public response, given to Pitchfork, described the intrusion as a "limited security incident" that it discovered in November 2025 and shut down fast. The company said no full credit card numbers were exposed and that the leaked code was outdated and no longer in use. What Suno did not dispute, in any statement I could find, is what the code says it scraped or how. It disputed the severity of the breach, not the accuracy of the training data disclosure.

Ten months sat between the breach and the story. That gap is its own small scandal: Suno knew about the intrusion in November 2025 and chose containment over disclosure, and the public only found out because the hacker eventually went to a reporter instead of staying quiet.

The hacker also pulled customer records: emails, phone numbers, and partial Stripe payment details for what the company itself has confirmed runs into hundreds of thousands of accounts. Suno did not notify affected users. Under most U.S. state breach-notification laws, a company has to disclose when names are exposed alongside financial account details, and Suno's own characterization of the incident as "limited" is doing a lot of work to avoid that trigger. Whether regulators agree is a separate open question from the copyright fight, but it is the same failure mode: the company deciding internally what counted as serious enough to disclose, and choosing not to.

Music producer Kenny Beats, whose work turned up in the dataset, reacted publicly once the source list went out, asking listeners who'd accused his tracks of sounding like "AI slop" whether that was because his songs were literally "22 of my songs" in Suno's training set. It's a sharp reframe: artists spent two years being told their suspicion that AI music borrowed their sound was paranoia, and this leak is the first document that lets any of them check.

Suno raised a $400 million Series D in June 2026 at a $5.4 billion valuation, more than doubling its November 2025 mark, even while Universal Music Group and Sony Music kept litigating. Warner settled and signed a licensing deal in November 2025 and dropped out of the case. UMG and Sony did not, and in May 2026 they moved to add 61,026 specifically identified copyrighted works to the complaint after audio fingerprinting through Audible Magic found far more matches than the original 560-song filing covered. None of that discovery process needed a hack. The Suno hack simply handed reporters, and by extension the labels' lawyers, a version of the same answer for free.

Here's where I have to correct something several outlets are still repeating in their Suno hack coverage. Reporting from early-to-mid June widely described a summary judgment hearing on Suno's fair-use defense as scheduled for July 2026, framed as the ruling that would decide the case this summer. A more recent tracker citing a June 30, 2026 amended scheduling order in the docket describes fact discovery now running to September 30, 2026, with dispositive motions not due until April 9, 2027. If that's accurate, the "summer 2026 ruling" a lot of June coverage promised isn't happening on that timeline, and a merits decision is a 2027 event at the earliest. I was not able to fully reconcile every dated claim against the live PACER docket in the time I had, so the honest position is: check the current UMG Recordings v. Suno docket (1:24-cv-11611, D. Mass.) directly before repeating a specific July 2026 hearing date, because the schedule appears to have moved since the earlier wave of coverage that the Suno hack is now getting folded into.

Either way, the Suno hack lands in the middle of active discovery, not after it. Evidence about scraping methodology and Bright Data proxy routing that a leak handed reporters for free is exactly the kind of material UMG and Sony's lawyers would otherwise spend months trying to compel through discovery motions.

If you're a musician who's used Suno to sketch ideas, the Suno hack doesn't change what you can legally do with what you've already generated. It does mean the platform's core defense, that it trained on lawfully accessible public data, now has a specific evidentiary record attached to it that didn't exist a week ago. If you're an independent artist wondering whether your own catalog is in there, there's no public lookup tool from the hack itself, and 404 Media has not published the full source list beyond the aggregate category names.

How much training data did the Suno hack reveal? 381,813 hours across nine sources, which is 43.6 years of continuous audio.

What percentage of Suno's training data came from YouTube, according to the Suno hack files? 69.7%, combining the youtube_music and ytm_tagged categories in the leaked source code.

Did Suno notify users about the hack? No. The company called it a limited, contained incident and did not send breach notifications, despite the hacker accessing emails, phone numbers, and partial Stripe payment data.

Is Suno's fair-use defense affected by the hack? The Suno hack adds evidence about scraping methodology, including Bright Data proxy use to bypass YouTube's bot detection, but it doesn't resolve the underlying fair-use question. That's still before Chief Judge F. Dennis Saylor IV in the District of Massachusetts.

When will the Suno lawsuit be decided? Unclear as of this writing. Widely reported July 2026 hearing dates, now getting repeated alongside Suno hack coverage, appear to conflict with more recent scheduling reports pointing to 2027. Check the live docket rather than trusting a specific date from June coverage.