Canon Color imageRunner C3220 Reference Manual page 25

I In Order to Avoid Unauthorized Use of the Machine
Unauthorized copies can be prevented by using the optional Key Switch Unit to manage
the operation of the Color imageRUNNER C3220/C2620. The use of this key should be
strictly supervised.
Security Key
When using the machine, insert the
security key into the main unit, and
then turn it to the right.
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