Microsoft has been providing a permissions system based on their Information Rights Management (IRM) concept for several years now, but with Office 2010 (including PowerPoint 2010), this whole concept has been implemented so intuitively that almost anyone can use IRM for their PowerPoint presentations and any other Office documents. Depending upon which version of Windows you use, you may need to download and install a Windows Rights Management module unless you use Windows 7 — if you use the latter configuration, the entire IRM implementation process is painless. If you use an earlier version of Windows, such as XP or Vista — then you might have to download and install a small WRM client that takes a minute or two.
Learn how to sign up for Windows Rights Management in PowerPoint 2010 for Windows.

