Emulators themselves have stood on fairly solid legal ground for decades. The trouble is almost always where the games come from.
Short version
- Making and using an emulator is generally legal in the U.S.; courts have treated reverse engineering for compatibility as fair use.
- Downloading or sharing ROMs of games you don’t own is copyright infringement.
- Breaking copy protection can violate the DMCA even for games you own, outside narrow exemptions.
- Official collections, subscription libraries and DRM-free stores are the legal ways to play classics.
Ask whether emulation is legal and you’ll get two confident answers, “totally” and “absolutely not,” and both are wrong. The honest answer splits in two, because an emulator and the games you run on it are separate legal questions.
This is a plain-English overview of U.S. law, not legal advice.
Emulator vs. ROM
An emulator is software that imitates a console’s hardware so its games can run on another device, like a PC or phone. A ROM, ISO or “dump” is a copy of a game itself. One is a tool; the other is the copyrighted work.
The emulator: mostly fine
The landmark case is Sony Computer Entertainment v. Connectix (9th Cir. 2000). Connectix sold the Virtual Game Station, which let PlayStation games run on Macs. Sony sued, and the appeals court held that Connectix’s copying of Sony’s BIOS during reverse engineering, done to make a compatible product, was fair use.
That reasoning is why emulator projects can exist openly. The picture changes when an emulator ships with copyrighted code such as BIOS files or encryption keys, or exists mainly to get around copy protection.
The games: where it gets risky
Downloading or sharing ROMs of games you don’t own is copyright infringement, full stop. Owning the original cartridge doesn’t make downloading someone else’s copy legal.
Copying your own games is murkier. Many games, especially newer ones, use encryption or other copy protection, and section 1201 of the Digital Millennium Copyright Act prohibits breaking it. The Copyright Office grants narrow exemptions every three years, including some for libraries and archives preserving games whose servers have shut down. In 2024 it declined to expand that exemption to let researchers access preserved games remotely. For older cartridges without encryption, whether a personal backup counts as fair use hasn’t been clearly settled by the courts.
The Yuzu case
In March 2024, the developers of Yuzu, a Nintendo Switch emulator, agreed to pay Nintendo $2.4 million and shut the project down. Nintendo’s lawsuit argued that Yuzu was built to play pirated games and required decryption keys taken from a Switch, which it said violated the DMCA. Because the case settled, no court ruled on emulation itself, but it shows where the legal pressure points are.
Why people care so much
In 2023, the Video Game History Foundation and the Software Preservation Network estimated that 87% of classic games released in the U.S. aren’t currently available to buy. For many old games, emulation is the only way anyone plays them now, which is why preservation groups push for broader exemptions.
Legal ways to play classics
- Official collections and remasters on current consoles and PC.
- Subscription libraries, such as the classic consoles in Nintendo Switch Online and the classics catalog in PlayStation Plus Premium. We compare those in our subscriptions guide.
- DRM-free stores like GOG, which sells many older PC games updated to run on modern systems.
- Original hardware and cartridges, if you don’t mind collector prices.
Heads up
ROM sites are a common source of malware, and “abandonware” isn’t a legal category. A game that’s no longer sold is usually still under copyright, which for most commercial games lasts decades.
Playing old cartridges the legitimate way? Their save batteries don’t last forever; see how to protect save data. And if you want a portable machine for retro collections, our handheld guide compares the options.
Quick questions
Can I download a ROM of a game I already own?
Not by default. Owning a cartridge doesn’t give you a license to download someone else’s copy. Making your own backup is a gray area, and breaking copy protection to do it can violate the DMCA.
Are BIOS files legal to download?
No. Console BIOS and system files are copyrighted. Some emulators avoid them with their own replacement code; others ask you to copy the files from a console you own.
Could I get in trouble just for using an emulator?
It’s unlikely. Legal action has historically targeted people who distribute ROMs, sell devices preloaded with games or supply tools for breaking copy protection.
Store policies, subscription terms and platform features change often. This guide is general information for players in the U.S., not legal advice; check the current terms on the store’s or platform’s own help pages before relying on them.