Pope Benedict XVI's Motu Proprio liberalising the Classical Roman Rite according to the Roman Missal of 1962, was released on 7 July 2007.
The text of the Holy Father's explanatory letter to Bishops is here http://www.vatican.va/holy_father/benedict_xvi/letters/2007/documents/hf_ben-xvi_let_20070707_lettera-vescovi_en.html
And the unofficial English translation of the offical Latin version of the Motu Proprio is available courtesy of Rorate Caeli http://rorate-caeli.blogspot.com/ here:
http://newcatholic.googlepages.com/summorum-latin-english-reg.pdf
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