Even NewAdvent must be confused because it spends pages and pages on giving this kind of convoluted explanation of their anti-Biblical musings...
"...A further distinction is that between perpetual indulgences, which may be gained at any time, and temporary,which are available on certain days only, or within certain periods. Real indulgences are attached to the use of certain objects (crucifix, rosary, medal); personal are those which do not require the use of any such material thing, or which are granted only to a certain class of individuals, e.g. members of an order or confraternity. The most important distinction, however, is that between plenary indulgences and partial. By a plenary indulgence is meant the remission of the entire temporal punishment due to sin so that no further expiation is required in Purgatory. A partial indulgence commutes only a certain portion of the penalty; and this portion is determined in accordance with the penitential discipline of the early Church. To say that an indulgence of so many days or years is granted means that it cancels an amount of purgatorial punishment equivalent to that which would have been remitted, in the sight of God, by the performance of so many days or years of the ancient canonical penance. Here, evidently, the reckoning makes no claim to absolute exactness; it has only a relative value."
PartiaL indulgence, perpetual indulgence, temporary indulgence, personal indulgence, plenary indulgence, real indulgence...
Say, what?
Do the writers of this have any idea that none of this stuff is in the Bible? It's all fiction.
Are you fiction? You’re not mentioned in the Bible so you must be fiction, right?
A former Protestant explains indulgences: http://www.catholic.com/thisrock/1994/9411fea1.asp
Also, please note, no one here yet has offered a single scrap of evidence that the Church or any pope even ever approved of the sale of indulgences as a proper act. How much you hate indulgences is irrelevant as to that point.