Retention-bound write-once enforcement designed to hold even against privileged administrative access.
Write-once retention is only meaningful against a defined adversary. Marking an object read-only defends against accident and casual modification; it does not defend against an actor holding administrative credentials.
Our architecture distinguishes these explicitly. On a local reference backend, retention locking relocates the asset, sets protective attributes, records a lock token, and structurally blocks writes through the governed interface. This is attribute-level immutability and is administratively reversible.
True write-once retention is a property of qualified storage platforms, object storage operating in a compliance retention mode, or enterprise storage with hardware-anchored retention, where an object cannot be overwritten or deleted before its retention expiry by any party, including the account owner.
Because governance is expressed through a single storage interface, the same policy and the same code path move between these backends without modification. What changes is the strength of the guarantee, and we state which guarantee applies in which configuration.
A design-stage extension specifies retention enforcement in a controller that owns the physical write-enable path: a protected write-once descriptor structure binds a storage range to a retention value expressed against a monotonic counter, and the program-enable path is held inactive while retention is unexpired.
In that embodiment a retention obligation is enforced by the device rather than observed by the host. It is described here as designed, not delivered.
Obligations expressed against non-rollback ordering.
Administratively reversible versus genuinely write-once.
Same governance across backends of differing strength.
Design-stage physical write-enable ownership.