I'm trying to protect a pdf file (i.e. a tax return printed to PDF) with password to open and password to modify. However I'm getting an error message in a pop up window saying..."The file may be read-only, or another user may have it open. Please save document with a different name, or in a different folder." I'm using WIN 8.1. and I'm using Adobe Acrobat Pro XI (student / teacher version). This is a standalone PC so I can't imaging someone else is using this file. Also I've tried renaming and saving to a different folder (from the folder the original file is saved). I've also looked at properties of the PDF file and its not tagged as read only. Please advise if I'm missing something. Thanks for your help.
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