According to the Oxford English Dictionary, authorization actually means
- Legally or duly sanctioned or appointed. Authorized Version of the Bible: a popular appellation of the version of 1611. (The Great Bible 1540, and Bishops' Bible (after 1572), actually bore on their titles ‘authorized and appointed,’ but that of 1611 has never claimed to be ‘authorized.’)
The Bishops' Bible continued to be in official use for the Church of England for decades after the 1611 was published, and the Geneva Bible continued its dominance in Scotland. A strange practice if the king had actually "authorized" a replacement Bible for the church that he was supposed to be the head of.
So, the KJV may be the only proper Bible, but all of the King James "authorization" rhetoric is not a historical reason for believing so. Think of it as more of a red herring in the real Bible translation debate.