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Appendix F: Secure Boot Settings
Forbidden Signatures
Forbidden Signature Database (DBX), which is the inverse of DB, contains forbidden certifi cates 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 fl ash drive. Select Update to load the factory
defaults or load DBX from a fi le 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 certifi cate from the key database. (Refer to page 166 for the Export pro-
cess. Refer to pages 167, 168, 169, and 170 for the Update process. Refer to pages 171 and 172 for the Append
process. Refer to page 173 for the Delete process.)
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