How do you make a PowerPoint show read only?

Answer 1

Look man if you want no one to modify this unless it is you,Do these steps.

• Go to Tools > Options. Click on the Security tab.
• To prevent unauthorized modification, type in a password under "Password to modify," then select OK.
• Enter a password. Re-enter your password to confirm. Select OK.
• Go to File > Save and close PowerPoint.
• The " Password to modify" will allow anyone to open a "read-only" copy of your presentation. This means no one can make any changes to your documentation unless they know the password.

• Like this you can enter the password to modify or just open read only.

  (Source): Me

Answer 2

While saving the PowerPoint file select save as type "Power Point Show" and click on save button. This will save your Powerpoint file in an read only executable file.