You'll forgive me if I don't hold to your memory's infallibility. :)
Perhaps if you can produce a reference to said document....
The idea that Catholics were not permitted to read the Bible on their own prior to 1952-54 was accepted church teaching and agreed upon by dozens of Catholics I knew.
However, I think it's become like Mel Gibson's faith -- now viewed as extreme, but prior to 1964, it was mainstream American Catholicism.
Just more rewritten history, IMO. But I'll give you that any supporting documentation today is ambiguous.