Go to View > Tabs > Properties or press ALT+P to show the Properties tab.The Document Properties dialog box appears. Click the Security icon on the Navigation bar.There are several ways to unlock a PDF/A file:
While the file is locked for editing, the command buttons and tools that will change the PDF are dimmed/unavailable. You will need to convert them to PDF/A again if you wish to archive them again. They will be saved as normal PDFs, however, not as PDF/A. Locked PDF archives can be unlocked, enabling them to be edited. This safety measure is meant to prevent accidental changes to the document that might invalidate the PDF/A compliancy.
Revu opens the these files as locked for editing by default (this can be changed in the PDF/A Preferences if desired). Because PDF/A is a long term archival format.
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