If you got a blue bar saying that You are viewing this document in PDF/A mode. when you open a PDF file, all editing features will be disabled.

The image illustratea blue bar saying that 'You are viewing this document in PDF/A mode'.

PDF/A is an ISO 19005-1 standard for PDFs. Documents you sent to OCR server are PDF/A-compliant. This mode will implement a set of restriction on the file to suite the long term archiving standard. Thus you cannot edit the file.

You can specify when and whether you want to view documents in this viewing mode with the following steps.

Procedures:

  1. Choose Edit -> Preferences (Windows) or Acrobat-> Preferences (Mac OS).
  2. Select Documents under Categories.
  3. Choose the option Never for View Documents In PDF/A.
    The image illustratea how to view documents in this viewing mode
  4. You can switch in or out of PDF/A viewing mode by changing this preference setting again.


References: PDF/A - from Wikipedia.