Office software is closely linked to the PDF,the PDF is also must have to control!
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20, at the "OK", you can see the digital certificates into a "registered" status. Opening an encrypted PDF document, enter the correct password will be by "have been sent" to "registered" status.
21, if the digital certificate is deleted or reinstall the system software, the need to import the digital certificate before the backup and click "Add Files" pop-up "to find the number of identity documents" dialogue.
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