Hi,
Did you use SharePoint web site, if so, you can control the document permission with SharePoint tools.
If you are using PowerPoint 2010, Click File > Info > Protect Presentations >
Restrict Permission by people, choose the option you want or customize with restricted access option.
You can also try to save it as PowerPoint Picture Presentation format, it cannot be edited then, but you still need to restrict permission to avoid copy or print. You can find it in
Save As list.
Daisy Cao
TechNet Community Support
