Password Protection « Introduction « Microsoft Office PowerPoint 2007 Tutorial

1.17.Password Protection
1.17.1.Add Password Protection to a PresentationAdd Password Protection to a Presentation
1.17.2.Open a Presentation with Password ProtectionOpen a Presentation with Password Protection
1.17.3.Change or Remove the Password ProtectionChange or Remove the Password Protection
1.17.4.Set password protection using file encryptionSet password protection using file encryption