Is Wi-Fi Direct secure, and how can I make it more secure?
By default, Wi-Fi Direct is set to 'Automatic' mode without an administrator password, which allows anyone within wireless range to connect and access all printer functions and settings. If higher security levels are desired, HP recommends changing the Wi-Fi Direct Connection Method from 'Automatic' to 'Manual' and establishing an administrator password. (Page 5)
From the official HP Deskjet Ink Advantage 3630 All-in-One Printer manual, page 5
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