A seismic object is a no-copy view into seismic stores. Once you have defined the object, either via a polygon to "cut out" from the origin seismic store or via an explicit trace-by-trace mapping, you cannot modify it. You can assign seismic objects to partitions and restrict user access to each partition. That way, seismic objects are the most granular unit of access control. Each seismic object has one corresponding partition. If a user is restricted to a specific partition, they will only be able to view the seismic objects that have been assigned to that partition.