It was fifty-one years ago today the the Vatican announced it had abolished the Index Librorum Prohibitorum, the Index of Prohibited Books. The Index can be traced, at least spiritually to the 9th century and the Decretum Glassianum. And, as the book we know and love since 1559. It would go through twenty editions, the last in 1948.
For those interested, here is a listing of the various books that have been included on that noxious document.