To limit access to the memory object, the creating program can use the FPROT and KEY parameters on IARV64. KEY assigns the storage key for the memory object, and FPROT specifies whether the storage in the memory object is fetch-protected. Storage protection and fetch protection attributes apply for the entire memory object. A program can only reference storage in a fetch-protected memory object that runs with the same PSW key as the storage key of the memory object or PSW key 0.