Though not designated as the official means of promulgating laws of the Holy See, this was on 23 May 1904 declared an organ of the Holy See to the extent that all documents printed in it were considered "authentic and official"
It is important because it announces to the Catholic Faithful of the election and or elevation of new bishops.
The Act confirms that Father Carlos Duarte Costa was first of all elected with authority of the Pope to be a Diocesan Bishop.
Secondly, it confirm beyond all reasonable doubt that the act took place.
The act also records the resignation of Bishop Carlos Duarte Costa. It also confirm any new appoints made with consent by the Pontiff at that time.
More so it also confirms that despite Archbishop Carlos Duarte Costa consecrating a bishop several years after his resignation in 1936 and several months after the expulsion by the then Roman Catholic Archbishop Jaime de Barros Camara, Archbishop of Rio de Janerio on 2nd July 1945.
A Bishop consecrated on 15th August 1945 by Archbishop Carlos Duarte Costa was accepted by Pope John XXIII in 1963 some 22 years later and served on all 4 Vatican II councils.
But nevertheless he remained a Roman Catholic Bishop. And by the acts that followed by the Pontiffs of Rome, this reaffirmed that Bishop Carlos Duarte Costa still possessed the power, intent to consecrated new bishops which is known as DE JURE & DE FACTO.
The Council of Trent (Latin: Concilium Tridentinum), held between 1545 and 1563 in Trent (or Trento, in northern Italy), was the 19th ecumenical council of the Catholic Church. Prompted by the Protestant Reformation, it has been described as the embodiment of the Counter-Reformation.
Being the seventh under the Sovereign Pontiff, Pius IV., celebrated on the fifteenth day of July, MDLXIII. DECREED AND PUBLISHED BY THE HOLY SYNOD OF TRENT, IN THE SEVENTH SESSION,
CHAPTER IV /
On the Ecclesiastical hierarchy, and on Ordination.
CANON II.--If any one saith, that order, or sacred ordination, is not truly and properly a sacrament instituted by Christ the Lord; or, that it is a kind of human figment devised by men unskilled in ecclesiastical matters; or, that it is only a kind of rite for choosing ministers of the word of God and of the sacraments; let him be anathema.
CANON III.--If any one saith, that, by sacred ordination, the Holy Ghost is not given; and that vainly therefore do the bishops say, Receive ye the Holy Ghost; or, that a character is not imprinted by that ordination; or, that he who has once been a priest, can again become a layman; let him be anathema.
CANON V.--If any one saith, that, in the Catholic Church there is not a hierarchy by divine ordination instituted, consisting of bishops, priests, and ministers; let him be anathema.
CANON VI.--If any one saith, that bishops are not superior to priests; or, that they have not the power of confirming and ordaining; or, that the power which they possess is common to them and to priests; or, that orders, conferred by them, without the consent, or vocation of the people, or of the secular power, are invalid; or, that those who have neither been rightly ordained, nor sent, by ecclesiastical and canonical power, but come from elsewhere, are lawful ministers of the word and of the sacraments; let him be anathema.
CANON VII.--If any one saith, that the bishops, who are assumed by authority of the Roman Pontiff, are not legitimate and true bishops, but are a human figment; let him be anathema. (This relates to Bishop Carlos Duarte Costa a Roman Catholic Bishop) After all he was assumed by the full authority of Pope Pius XI in 1924.