The one circumstance in which you can save an updated document is when the PDF file is enabled with usage rights. Adobe Acrobat 7 Professional users can enable PDFs with usage rights for the purposes of comment and markup. Enterprises may use the affordable Adobe LiveCycle Reader Extensions to add usage rights for saving form data and adding digital signatures in addition to adding comment and markup. When any of these usage rights have been added to a PDF file, both a Save command and a Save As command appear in the File menu.
To save a file from Adobe Reader:
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