How can I encrypt my presentations with password in PowerPoint?

In Office, you can use a password to help prevent other people from opening or modifying your documents, workbooks, and presentations. Then you can easily remove passwords to unprotect a document or workbook if read only is no longer required. Also, you can use document protection to restrict the types of changes that reviewers can make.

Important: 

• End Users: Keep your password in a safe place. If you lose or forget the password, it cannot be recovered or removed.

• Enterprises: If you're concerned about losing access to password protected Office files in your enterprise, the DocRecrypt tool might be for you. Note that you have to deploy the DocRecrypt tool BEFORE the file in question is password protected. DocRecrypt can't retroactively recover files that were password protected before you deployed DocRecrypt. For more information see: Remove or reset file passwords using DocRecrypt.

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