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Appendix F: Secure Boot Settings
Forbidden Signatures
Forbidden Signature Database (DBX), which is the inverse of DB, contains forbidden certificates and digital signatures.
The options are Details, Export, Update, Append, and Delete. Select Details to display detailed information of Forbidden
Signatures. Select Export to save the current DBX to a FAT formatted USB flash drive. Select Update to load the factory
defaults or load DBX from a file on the external device. Select Append to add variables to the existing DBX. Select Delete
to clear the current DBX or to delete only one certificate from the key database. (Refer to page 180 for the Export pro-
cess. Refer to pages 181, 182, 183, and 184 for the Update process. Refer to pages 185 and 186 for the Append
process. Refer to page 187 for the Delete process.)
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