DMTF Redfish updated, includes UEFI Secure Boot changes

[…]New schemas include the addition of SecureBootDatabase and Signatures for managing UEFI Secure Boot databases using Redfish. The schema updates include SecureBoot, Certificate, CertificateCollection, and CertificateLocations.[…]

https://www.dmtf.org/content/new-redfish-release-20201-adds-support-network-device-registry-secure-boot-database-and

It looks like the main DMTF Redfish web sites are not yet updated with pointers to above spec, beyond the above press release page. Use that page for download links.