how do i save a publisher file as read only so no one can change

[Mary Sauer]

You will never be able to save a Publisher file that folks can't edit. Convert
it to a PDF or an image. The method is exactly as Morisot described. There are
free PDF converters around.
http://www.google.com/search?hl=en&q=free+pdf+converters&btnG=Google+Search