Final answer:
Habeas corpus is the principle that requires the government to prove a person's imprisonment conforms to the law or release them immediately.
Step-by-step explanation:
The principle being referred to in the question is called habeas corpus.
Habeas corpus is a legal principle that ensures that a person cannot be held in jail without being informed of the charges against them and being given the opportunity to appear before a judge.
It is a fundamental right included in many countries' legal systems to protect an individual's liberty.