If you’re using OS X Lion (v10.7) or later, you can lock your presentation so you can’t edit it by accident, when you only intend to open and view it. You can easily unlock the presentation at any time to continue editing it.

To lock a presentation:
  1. Open the presentation you want to lock, and hold your pointer over the name of the presentation at the top of the Keynote application window.

    A triangle appears.

  2. Click the triangle and choose Lock.

To unlock a presentation for editing:

Hold your pointer over the name of the presentation at the top of the application window until the triangle appears, click the triangle, and then choose Unlock.

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