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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 186 for the Export process.
Refer to pages 187, 188, 189, and 190 for the Update process. Refer to pages 191
and 192 for the Append process. Refer to page 193 for the Delete process.)
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