Is Wi-Fi Direct secure by default on the HP DeskJet 3720?
By default, the Wi-Fi Direct setting is in 'Automatic' mode without an administrator password, which allows anyone within wireless range to connect and access all printer functions and settings. If higher security is desired, HP recommends changing the Wi-Fi Direct Connection Method from 'Automatic' to 'Manual' and establishing an administrator password.
From the official HP Deskjet 3720 All-in-One Printer manual, page 2
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