Declassifying ancient history

Here's a bizarre story.  The National Security Agency just declassified a text on cryptology.  All well and good, and glad to see government information becoming more free, etc. 

Only this text is 200 years old has been in the public domain (and available) for a long time. Actually what was declassified (and there is argument over whether it was ever actually classified) is a 40 page abstract that was captured in Germany.  The full 500-page text has been on the web for years. Upward and onward with freedom of information.

Tip of the tail to Secrecy News.