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(1) In respect of persons serving a sentence of imprisonment for the commission of a minor or less serious and serious offence, the court, taking into account their conduct during the execution of the sentence, may issue a decision on the replacement of the unexecuted part of the sentence by a lighter sentence. At the same time, the person may be released, in whole or in part, from the additional penalty.

(2) The replacement of the unexecuted part of the sentence by a more lenient penalty may be applied only after the sentenced person has actually served at least one third of the term of the sentence for a minor or less serious offence and half of the term of the sentence for a serious offence.

(3) When replacing the unexecuted part of the sentence by a lighter sentence, the court may choose any lighter sentence provided for in Article 62, within the limits laid down for each type of penalty.

(4) When replacing the unexecuted part of the sentence by a more lenient sentence, the court may oblige the convicted person to fulfil the obligations provided for in Article 90 paragraph (6) within the term of the sentence, to which he was sentenced, remaining unexecuted.