Selecting fetch protected or non-fetch protected storage
Fetch protection helps prevent unwanted read access to your storage. A program can read from fetch protected storage only if its PSW key matches the storage key of the storage area or if its PSW key is 0. Non-fetch protected storage can be read by any program.
Note: Although you can obtain fetch-protected storage in
key 8, the storage is only protected from accidental access because
any program can switch into PSW key 8 and thereby obtain access to
key-8 storage.