Microsoft PowerPoint is a powerful and feature-rich software that allows you to create stunning slides to use in your meetings and discussions. You might find yourself in situations where your presentation contains confidential information that you want to guard. In such cases, protecting the presentation file with a password can prove to be helpful. On the other hand, if you want to mark a presentation as final and do not want its contents to be modified, you can digitally sign the presentation file. As long as the signature is valid, you can be confident that the presentation file has not been altered. In light of that, this article will teach you how to protect PowerPoint presentations with a password or digital signature using C++.