Have a look at:
"Password protect a presentation"
http://pptfaq.com/FAQ00038.htm

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Shawn Toh (tohlz)
Microsoft MVP PowerPoint
Site Updated: Sept 05, 2007
(Amazing PowerPoint animations, artworks, games here)
http://pptheaven.mvps.org
PowerPoint Heaven - The Power to Animate
> My boss would like to give copies of his presentations to others so that
> they can just "click" their way through the slides, but cannot alter it in
> anyway. I am a newbie to PP and will muchly appreciate any suggestions.
> Thanks!!!