A long-standing Latin Mass held at St. Patrick’s Cathedral in Melbourne has been canceled by the Vatican under the provisions of Traditiones Custodes.
V.R.S.
A grotesque pic as Quo primum has nothing to do with Ecclesia Dei or Summorum Pontificum.
Novena - Oremus
Agreed.
Klaus Elmar Müller
Archbishop Lefebvre taught us that in dire emergencies no documents are needed to celebrate a genuine liturgy.
V.R.S.
In fact we have here some documents but of course we start from the ancient liturgical usage/custom of the Holy Roman Church named the Roman Rite. Post-conciliar popes & bishops abandoned it but it is their problem not ours.
Moreover, we have decrees of the Council of Trent that referred directly to the Roman Rite Mass and its parts (the Roman Canon in particular) confirmed in the Professio Fidei …More
In fact we have here some documents but of course we start from the ancient liturgical usage/custom of the Holy Roman Church named the Roman Rite. Post-conciliar popes & bishops abandoned it but it is their problem not ours.

Moreover, we have decrees of the Council of Trent that referred directly to the Roman Rite Mass and its parts (the Roman Canon in particular) confirmed in the Professio Fidei Tridentina of Pope Pius IV - Professio fidei Tridentina
(... I also receive and admit the accepted and approved rites of the Catholic Church in the solemn administration of the aforesaid sacraments - cf. also "Tridentine" Canon XIII on the Sacraments in general) and of course - Quo primum, quoted in all the future editions of Roman Missal up to 1962 (with bulls of later popes - Clement VIII, Urban VIII, Pius X).

At last, we have one sound sentence in Summorum Pontificum - an admittance that the Roman Rite has been never abrogated.

Against the above we have tyranny of post-conciliar popes starting from Paul VI to destroy the ancient Roman Rite de facto (and the fundamental lie that the Novus Ordo mutation/morphed rite is the same rite as the Roman Rite based on the one and only "synchronic" premise i.e. that Rome started to use it in 1969/70).

PS We have also the 1917 Code of Canon Law (canons 756 and 98) providing that children of parents of the Roman Rite have a right and obligation to belong to the rite of the parents. My parents, for example, were not baptized in the realm of Novus Ordo so I had the full privilege to receive the Roman rite of my parents (even with the delay caused by revolutionaries acting illicitly).