Analysis of information sources in references of the Wikipedia article "Missale Romanum (apostolic constitution)" in English language version.
Instead of a 'universal Indult', Benedict released Summorum Pontificum. This was not a mere concession to existing liturgical law: it was a rewriting of it. ... While it is viewed as 'different' from the ordinary, [the Extraordinary Form] is given almost all the same rights as the ordinary.
The Instruction of 14 June 1971 provided that celebration of Mass according to the former rite would be permitted, by faculty from the Ordinary, only for aged or sick priests offering the sacrifice without a congregation.