Fujitsu ECLIPSE CD8445 Owner's Manual page 31

Press the [FUNC] button for more than one second.
The security code is registered in the deck and security is set.
The registered security code is encrypted and then written to
Memory Stick.
When the security code is registered using a Memory Stick that
contains several kinds of data, such as music, etc., be careful not to
clear the recorded data by formatting the Memory Stick.
Eject the Memory Stick.
Refer to "Ejecting the Memory Stick" on page 94.
ESN security operating procedure
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