On Apple devices running iOS operating systems, jailbreaking is a privilege escalation executed to remove software restrictions imposed by the manufacturer. Typically it is done through a series of kernel patches.
Is jailbreaking Legal?
Jailbreaking itself usually is not illegal. ... While the act of jailbreaking a phone is not illegal in itself, what you do with a jailbroken phone may cause problems. Using a jailbroken device to access pirated or legally restricted content is against the law.
What happens when you jailbreak a phone?
To “jailbreak” means to allow the phone's owner to gain full access to the root of the operating system and access all the features. Similar to jailbreaking, “rooting” is the term for the process of removing the limitations on a mobile or tablet running the Android operating system.