Liberty is the value of individuals to have agency (control over their own actions).
“In the state of nature, liberty consists of being free from any superior power on Earth. People are not under the will or lawmaking authority of others but have only the law of nature for their rule. In political society, liberty consists of being under no other lawmaking power except that established by consent in the commonwealth. People are free from the dominion of any will or legal restraint apart from that enacted by their own constituted lawmaking power according to the trust put in it. Thus, freedom is not as Sir Robert Filmer defines it: ‘A liberty for everyone to do what he likes, to live as he pleases, and not to be tied by any laws.’ Freedom is constrained by laws in both the state of nature and political society. Freedom of nature is to be under no other restraint but the law of nature. Freedom of people under government is to be under no restraint apart from standing rules to live by that are common to everyone in the society and made by the lawmaking power established in it. Persons have a right or liberty to follow their own will in all things that the law has not prohibited and not be subject to the inconstant, uncertain, unknown, and arbitrary wills of others.” John Locke
One's liberty should not be viewed as the absence of interference in one's actions, but as non-dependence.