The matter of the gloss refers to the thesis of the Judgment of the Supreme Court, taking up the issue of contraventionalization, included in art. 2a § 1 of the Offense Code. Therefore, the problem of contraventionalization is subjected to scientific analysis; in particular – in this perspective – replacing a unexceeded penalty of deprivation of liberty (a penalty for a crime) into a penalty of arrest (a penalty for an offense). The scientific narration is being performed in the perspective of the legal status de lege lata and in the doctrinal and juridical perspective. The conducted research allowed to consider the statement resounded in the glossed thesis as justified, that’s mean, that contraventionalization results from art. 2a § 1 o.c. does not change a final conviction for a crime into a conviction for an offense, but solely changes the convictioned penalty of deprivation of liberty for a crime into arrest penalty in an amount equal to the upper limit of the statutory threat for such an act. Therefore, the gloss has an approving character.