A convict who shall pass the entire period of his imprisonment without a
violation of the rules and discipline, except such as the Warden or Board
of Control shall excuse, shall upon his discharge from prison be restored
to the rights and privileges forfeited by his conviction, and shall
receive from the Governor a certificate under the great seal of the state
as evidence of such restoration, to be issued upon presentation to the
Governor of a certificate of such conduct, which shall be furnished to
such convict by the Warden.