97Therefore, a measure relating to the execution of a sentence will be incompatible with Article 49(1) of the Charter only if it retroactively alters the actual scope of the penalty provided for on the day on which the offence at issue was committed, thus entailing the imposition of a heavier penalty than the one initially provided for. Although that is not, in any event, the case where that measure merely delays the eligibility threshold for release on licence, the position may be different, in particular, if that measure essentially repeals the possibility of release on licence or if it forms part of a series of measures which have the effect of increasing the intrinsic seriousness of the sentence initially provided for.
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