This time, the Protestants were openly questioning all the dogmas of the Faith. The Council of Trent had to address itself to the entirety of Catholic dogma. And the Council Fathers did so with such holy thoroughness that their dogmatic decrees were infallibly declared by Pope Pius IV, and promulgated by Pope Saint Pius V. It is for this reason the Council of Trent is universally regarded as the greatest of the general councils of the Church and is often referred to as “the infallible Council of Trent.”http://catholicism.org/catechism-council-trent.html
"Often referred to"...?!
That's seriously the extent of your argument? Someone's slang-term for the Holy Council of Trent? The Council of Trent CONTAINED infallible decrees, certainly... but, just as voting fraud issues can reasonably be restricted to prosecuting HUMANS, infallibility issues are restricted to instances of DOCTRINE. To talk about policies/disciplines being "infallible" is nonsense; it's a bit like saying that "the U.S.A. decision to require driving on the right side of the road was an infallible decision"--bizarre, and shows a complete misunderstanding of the basic terms.
Let me try this again, since the claimed level of knowledge of some Protestants about the Catholic Church far outstrips their actual knowledge of the Catholic Church (willfully, or not):
The Catholic Church is infallible when it defines a particular dogma--i.e. when it formally pronounces that [x] is true, [x] is part of the Deposit of Faith (i.e. God's Divine Revelation), and all Catholics are bound (on pain of heresy) to believe [x]. In other words: when defining a dogma (i.e. solemn teaching, binding on all the faithful), the Church cannot err.
DISCIPLINES have absolutely NOTHING to do with the charism of infallibility. Nothing. Whatsoever. They are policies, and they can be changed at need.
Can you supply us with documents that this "Rule" was officially changed by Rome ??
Yes. Blessed Pope Paul VI abolished the Index of Forbidden Books (more's the pity) on December 7, 1965, in the
motu proprio titled "Integrae Servandae" This act released (again, more's the pity) all restrictions on private use of translations of the Bible which contain Protestant (and other) errors.