In Acrobat Professional, File, Open, at the View dropdown, choose Details, then right-click in one of the column headers, and click on 'Protected'. See if that shows what you're looking for....
Very strange. I just flagged a file Read-Only, and looked with the Protected column displayed, and it didn't show anything either. Have you tried posting this issue on Adobe's web site ? I wonder what 'Protected' IS supposed to show ?
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