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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 184 for the Export process.
Refer to pages 185, 186, 187, and 188 for the Update process. Refer to pages 189
and 190 for the Append process. Refer to page 191 for the Delete process.)
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