Checking the protection attributes of tape files

When a tape file is created, the attributes are stored in the file catalog. If the catalog entry is deleted, only the entries in the tape labels are available.

During read and write accesses to tape files, the entries in the file catalog are compared with the entries in the tape labels. Depending on the authorization of a user ID and the user specifications for access to the tape file (command ADD-FILE-LINK, operand LABEL-TYPE or BYPASS-LABEL-CHECK), the prevailing security measures can be bypassed.