Comment by hnlmorg
I don’t know of any country where emulation is illegal? Do you?
As the GP pointed out, OEMs use copyright and encryption to protect against unapproved execution. But that doesn’t apply to all systems.
Given countries like the UK and US have the strictest intellectual property and computer misuse laws, and emulation is legal there (bar the aforementioned caveats), I’d be surprised if there was a jurisdiction where emulation was illegal. However if you do know of somewhere then please do share.
To my knowledge emulation is illegal in Japan, as is modding consoles.
Edit: I looked into it a bit more. As it is against the law to dump ROMs from games you have legally purchased, as well as acquiring them through other channels, there is no way to emulate games in Japan in a legal manner.