If my memory serves correctly, it was protected right up until Phil Zimmerman circumvented them by writing a book containing the source code for PGP and winning

If my memory serves correctly, it was protected right up until Phil Zimmerman circumvented them by writing a book containing the source code for PGP and winning the case based upon the argument that the book was protected by his constitutional right to freedom of speech(?) Unfortunately, you can't put the cat back in the bag. It's no good putting export restrictions on encryption when the tightest encryption we have at present is already available all round the world.