Sony PEG-S300 - Manual (Page 122)

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Protecting data
Your Sony handheld includes a Security application that lets you set
options to protect data from unauthorized users. The Security application
lets you hide records that you have defined as private, with or without a
password.
Assigning a password
You can assign a password to protect your private records and to lock your
Sony handheld.
1
Tap the icon and select System from the dropdown list
in the upper right corner.
The System screen appears.
2
Tap .
The Security dialog box appears.
3
Tap Unassigned.
The Password dialog box appears.