The claimed principle was simple: export of munitions—guns, bombs, planes, and software—was (and remains) restricted; but the export of books is protected by the First Amendment.
声明的原则很简单：对军需品——枪支、炸药、飞机和软件的出口是被限制的，然而书本出口受到第一修正案（言论自由部分）的保护。