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The security key authentication function registers a security key in a program file and prevents unauthorized execution or access
to the program. You can set this function with the following two methods.

(1) Preventing unauthorized access to a program
This function allows or does not allows an operation to the program depending on whether a security key in the program file
and the one of a personal computer match or not.

(2) Preventing unauthorized execution of a program in a CPU module
This function allows or does not allows an operation to the program depending on whether a security key in the program file
written in a CPU module and the one of the CPU module match or not.

For details, refer to the following manual.
– GX Works3 Operating Manual 5. MAINTENANCE AND INSPECTION 15. PROTECTING DATA
15.2 Preventing Illegal Access to Programs (Protected by Key)

More information found HERE.