You can disable this protection in a locked item by unlocking it, returning to the Save As dialog and unchecking the Encrypt box. Next time you want to open this item a password will be required. Enter the password you want to use in these boxes.
Once you do, you’ll see a Password and a Verify box appear.Select Save As and then in the subsequent dialog box tick the Encrypt box at the bottom.Open the file menu and press the Option key – the Duplicate item should turn into a Save As command.
You can also use Preview to lock PDF files (these don’t need to have been created in Preview). You’ll be asked to set a password, hit OK when you are done. Next time you open the document you’ll be asked for the password.
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