The ECHR hasn't gone far enough.
Articles of the Universal Declaration of Human Rights
Article 3: Everyone has the right to life, liberty and security of person.
(Imprisonment gets the third bit right, but isn't too hot on the liberty bit.)
Article 4: No one shall be held in slavery or servitude; slavery and the slave trade shall be prohibited in all their forms.
(
http://prisonuk.blogspot.co.uk/2014/07/forced-labour-and-slavery.html )
Article 5: No one shall be subjected to torture or to cruel, inhuman or degrading treatment or punishment.
(Name ten reasons why being imprisoned is degrading.)