Nintendo's Aggressive Anti-Piracy and Emulation Stance Explained

Nintendo's reputation for vigorously pursuing legal action against emulator developers and piracy is well-established. Recent examples include the $2.4 million settlement with Yuzu emulator developers in March 2024, the cessation of Ryujinx development in October 2024 following Nintendo's intervention, and the legal advice preventing a full Steam release of the Dolphin emulator in 2023. The infamous 2023 case against Gary Bowser, who resold devices allowing users to bypass Nintendo Switch anti-piracy measures, resulted in a $14.5 million debt to Nintendo.

Now, a Nintendo patent lawyer has shed light on the company's strategy. At Tokyo eSports Festa 2025, Koji Nishiura, Assistant Manager of Nintendo's Intellectual Property Division, clarified the legal complexities surrounding emulators. While emulators themselves aren't inherently illegal, their use can become illegal depending on functionality. Specifically, emulators that copy game programs or disable console security measures infringe on copyright.

Nishiura cited Japan's Unfair Competition Prevention Act (UCPA) as the primary legal basis for action, although its limited extraterritorial reach hinders international legal pursuits. He used the Nintendo DS "R4" card as an example – a device enabling pirated game execution – which was successfully outlawed in Japan in 2009 following legal action by Nintendo and other software manufacturers.

Furthermore, Nishiura highlighted the illegality of "reach apps" – third-party tools facilitating pirated software downloads within emulators. Examples include the 3DS's "Freeshop" and the Switch's "Tinfoil." These tools, he argued, also violate copyright laws.

The Yuzu lawsuit underscored the financial stakes involved. Nintendo alleged one million instances of The Legend of Zelda: Tears of the Kingdom piracy facilitated by Yuzu, citing the emulator's Patreon page, which generated $30,000 monthly through premium features and early access. This highlights Nintendo's focus on the financial impact of emulation on their revenue streams.