The RESTRICT (Set Restrictions) system command is intended to aid control of the importation of potentially hazardous files. System files, compilers, backup files, and code files can, by their nature, compromise the security of the computer system, and so are considered potentially hazardous. Specifically, a file is potentially hazardous if the value of its FILEKIND attribute is 63 (code file) or less.

The HOSTSRESTRICTED system security option places restrictions on the importation from foreign hosts of system files, compilers, backup files, and code files, and on the exportation to foreign hosts of program dump files. When the HOSTSRESTRICTED option is TRUE, all remote hosts are treated as restricted hosts. Only a user with security-administrator status can open hazardous files from a restricted host.

For information about restricted files, see “RESTRICT (Set Restrictions) Command” in Controlling File Access. For information about the HOSTSRESTRICTED option, see Controlling System Security.

Potentially hazardous files, along with their mnemonic values for FILEKIND, are as follows.