Canon Color ImageRunner C3380 Reference Manual page 300

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License Registration
Enter the license key using
[Start].
Details of each item are shown below.
Press to move the cursor to the desired position.
[ ][ ]:
[Backspace]: Press to delete the last number entered.
If the following screen is displayed, press [OK] ➞ enter the correct license key.
If the following screen is displayed, the required optional equipment needed for
license registration has not been installed. Press [OK] ➞ install the required
optional equipment or make sure that the required optional equipment is installed
properly ➞ try registering the license key again.
(numeric keys) ➞ press
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