Brother MFC-8810DW - Manual (Page 26)

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Digital Certificate for Signed PDF
4
Import and export a CA certificate
4
You can store a CA certificate on the machine by importing and exporting.
How to import a CA certificate
4
a
Click CA Certificate on the Security page.
b
Click Import CA Certificate and choose the certificate. Click Submit.
How to export a CA certificate
4
a Click CA Certificate on the Security page.
b Choose the certificate you want to export and click Export. Click Submit.
c Click Save to choose the destination folder.
d Choose the destination you want to save the exported certificate and then save the certificate.