A 5ch thread reminiscing about Winny, the file-sharing software that took Japan by storm in the early 2000s, blew up with activity. It started with posts recalling the era’s vibe — most of the PCs in university computer labs showing the Winny screen, movies circulating online the very day they hit theaters — before spiraling into a debate over the arrest of its developer, Isamu Kaneko, on charges of aiding and abetting copyright infringement, and whether that arrest was justified. Posters split between those who argued the crackdown chilled Japan’s entire IT industry and those who said it was inevitable given how much copyright infringement the software enabled, with comparisons to America’s Napster and theories linking Winny’s architecture to the origins of Bitcoin flying back and forth.
What people said
1AnonymousSep 27, 2026 21:42
Even the random middle-aged guy down the street was using it like it was nothing
3AnonymousSep 27, 2026 21:44
Whenever you walked into the university computer lab, there'd always be two or three PCs sitting on the Winny screen
4AnonymousSep 27, 2026 21:44
It got casually written up in random magazines like it was some kind of secret life hack — Winny, Share, overseas ROM distribution sites, emulator software, the works
5AnonymousSep 27, 2026 21:46
Movies were already circulating online on the very day they opened in theaters
11AnonymousSep 27, 2026 21:48
Re: #5 There were even cases where an overseas early release got slapped with Japanese subtitles and was circulating before the movie even opened in Japan
9AnonymousSep 27, 2026 21:47
I was more of a WinMX and Cabos (a Gnutella-based file-sharing client popular in Japan) guy myself
10AnonymousSep 27, 2026 21:47
If I remember right, you'd copy-paste a handful of initial node addresses from somewhere and grow your connections out from there.
The bigger files that turned up were usually cracked gal games, manga, pirated software itself, albums — that sort of thing
13AnonymousSep 27, 2026 21:49
The generative AI industry right now has that same reckless, anything-goes energy Winny had at its peak.
Really shows you just how far behind Japan has fallen
16AnonymousSep 27, 2026 21:51
Re: #13 People say Japan's IT industry died because of how the Winny case was handled
17AnonymousSep 27, 2026 21:52
Re: #16 For some reason everything gets a pass in Japan as long as it stays underground — the moment it surfaces publicly, it gets crushed. That's exactly what happened to IT right around then
29AnonymousSep 27, 2026 22:00
Re: #16Re: #17 I mean, Napster — basically Winny's ancestor — got busted too, and honestly, given how it was built and released, it's hard to believe copyright-infringing file swapping wasn't baked into the plan from the start
18AnonymousSep 27, 2026 21:54
With something like cars, where a breakdown can mean death, safety-first makes sense.
But for IT, full-speed-ahead development with no brakes was the only way to seize dominance
19AnonymousSep 27, 2026 21:54
Wonder how things would've turned out if that developer were still alive
24AnonymousSep 27, 2026 21:57
Roasted garlic (a random non sequitur — a running joke on the thread)
25AnonymousSep 27, 2026 21:58
Re: #24 'Cluster word' — now that's a name I haven't heard in a while
39AnonymousSep 27, 2026 22:05
By the way, it was none other than the 'Holy Emperor' (an online nickname for a politician known for his tough-guy image) who, back when he was Chief Cabinet Secretary, publicly urged citizens not to use Winny
46AnonymousSep 27, 2026 22:08
Re: #39 Funny how things turn out — he'd later become a meme and one of Japan's most widely used free stock-photo models
57AnonymousSep 27, 2026 22:11
Re: #39 The man who has every hose (a famous free-stock-photo meme)
40AnonymousSep 27, 2026 22:05
Sure, it was lawless, but it was also genuinely innovative.
A country that could only respond to that with regulation was always going to decline
52AnonymousSep 27, 2026 22:10
Re: #40 Reminder that Napster got crushed in the US too — same story
47AnonymousSep 27, 2026 22:08
Honestly, piracy is still a total free-for-all even today
51AnonymousSep 27, 2026 22:10
Re: #47 Back then there were tons of books published about it and people did it completely out in the open — that's a whole different level from now
55AnonymousSep 27, 2026 22:11
Re: #51 I don't know about that.
You can still do it wide open today.
Zero people have ever been arrested for illegal downloading (not counting those who turned themselves in).
Just search '[whatever] free download' and you'll pull up games, manga, movies, anything.
And downloads are way faster than they used to be, too
58AnonymousSep 27, 2026 22:13
Re: #55 P2P involves uploading — that's a different ballgame entirely
67AnonymousSep 27, 2026 22:18
Re: #52 Napster wasn't a criminal case, makes no sense to lump it in with this
94AnonymousSep 27, 2026 22:31
Re: #67 Reminder that they got hit with massive damages and forced to shut down the service. Winny's developer faced criminal charges but managed to dodge civil liability
71AnonymousSep 27, 2026 22:22
Come to think of it, was there some specific trigger that turned this into a problem?
Illegal uploads shared via Winny drew attention, and that's ultimately what led to the outrageous step of arresting the creator himself
78AnonymousSep 27, 2026 22:25
Re: #71 A Kyoto Prefectural Police officer got infected with the 'Kintama' worm (malware that leaked users' files via Winny), and the police were furious about losing face over it. Apparently the officer who'd actually been using it faced no disciplinary action whatsoever
74AnonymousSep 27, 2026 22:24
Unfairly crushing Winny's developer was a bad move,
but a genius doesn't stay down that easily.
The system Winny helped pioneer — individual users building an encrypted network among themselves without relying on central servers —
went on to give rise to blockchain and the creation of Bitcoin
79AnonymousSep 27, 2026 22:25
Re: #74 They dragged him through the courts for years and crushed him anyway
84AnonymousSep 27, 2026 22:28
88AnonymousSep 27, 2026 22:29
Re: #84 This is genuinely spot on
91AnonymousSep 27, 2026 22:29
Re: #84 Quit talking out of your ass
92AnonymousSep 27, 2026 22:30
Re: #84 Sounds ridiculous at first, but it turned out to be right
96AnonymousSep 27, 2026 22:31
File sharing and drone technology both died out the exact same way, huh
100AnonymousSep 27, 2026 22:34
Re: #96 I mean, even China, a drone superpower, will arrest ordinary citizens for flying drones wherever they please, you know?
98AnonymousSep 27, 2026 22:34
Re: #87 Sounds like you don't even know the backstory here. After an earlier arrest, everyone on the download board was panicking about 'guess we can't use WinMX anymore' — so Kaneko stepped up, said he'd build something with anonymized, encrypted connections so nobody could get arrested, and then built and released it. Given that, it's hard to see it as anything other than premised on illegal uploading from day one
102AnonymousSep 27, 2026 22:36
Re: #98 In any era, resisting information censorship is only natural, if you ask me
Background and Key Points of This Discussion
Winny was a P2P file-sharing program released in 2002. Its developer, Isamu Kaneko, was arrested and indicted in 2004 on suspicion of aiding and abetting copyright infringement. He was convicted at trial, acquitted on appeal, and the Supreme Court finalized that acquittal in 2011. In other words, it’s a commonly misunderstood point that he was ‘found guilty simply for building the software’ — the courts ultimately affirmed the opposite. The theory floated in the thread that ‘Winny became a technical forerunner of Bitcoin’ remains no more than a popular claim and isn’t an established historical fact. The Napster comparison also came up, but it’s worth noting the legal situations differ: Napster was driven into paying damages and shutting down its service through a civil lawsuit brought by copyright holders, whereas with Winny it was the individual developer who faced criminal prosecution.
※This article is compiled as excerpts and a summary from the 5ch “Nandemo Jikkyo G” (Live Commentary, general) board thread “Winny Was Amazing at Its Peak.”
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