01 / THE DEVICE
The capture device is gone.
A camera or phone is seized, destroyed or lost. Its local copy is no longer available.
WITHOUT AN INDEPENDENT COPY
The file dies with the device.
When the only copy is on the camera, destroying it destroys the route back to the photograph.
WITH URMA
The original stays in reach.
A reader retrieves the completed publication from accessible historical records and opens it with the separately kept key. The original device is not required.