If you are using PowerPoint 2002/XP and above,
you can set password to protect your presentation from modifying.
Go to Tools > Options > Security. Set your password there.
If you are using PowerPoint 2000 and below, this feature isn't supported.
You can though, embed your presentation into MS Word or Excel.
Check this out for more information:
"Password protect a presentation"
http://www.rdpslides.com/pptfaq/FAQ00038.htm

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Shawn Toh (tohlz)
Microsoft Most Valuable Professional (MVP PowerPoint)
Site Updated: June 08, 2006
Added PowerPoint Movies.
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> How can I protect my presentations to be copied or edited by others?
>
> Is there a macro for that purpose?
>
> Thanks
TTMinh - 12 Jun 2006 12:53 GMT
Many thanks Shawn Toh for your prompt and helpful information. Minh
> If you are using PowerPoint 2002/XP and above,
> you can set password to protect your presentation from modifying.
[quoted text clipped - 12 lines]
> >
> > Thanks