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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 204 for the Export process.
Refer to pages 205, 206, 207, and 208 for the Update process. Refer to pages 209
and 210 for the Append process. Refer to page 211 for the Delete process.)
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