modprobe or insmod errors with "Required key not available"

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Issue

When loading a kernel driver module with modprobe or insmod, the module load fails, and the following error is displayed:

FATAL: Error inserting <modulename>: Required key not available

insmod: error inserting <modulename>: -1 Required key not available

Environment

Red Hat Enterprise Linux 6
modprobe or insmod
Kernel module not shipped in this Red Hat Enterprise Linux kernel package

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