Sony DPT-RP1 Help Manual page 15

To disable the screen lock
When the entry screen for the lock password is displayed, align
the center of the FeliCa card or (FeliCa mark) on the
FeliCa-compatible device with (N mark) on the Digital Paper
for about two seconds.
To delete the registered information for a FeliCa
card/FeliCa-compatible device
Press the (home) button, and tap [Settings] — [System
Settings] — [Screen Lock] — [NFC Card Lock Release Settings].
Enter the lock password, and tap [OK] then [Deregister NFC
Card].
To register a different FeliCa card/FeliCa-compatible
device
Only one FeliCa card/FeliCa-compatible device can be
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