D-Link DHP-300 Quick Install Manual page 10

Configuration
Red text on the MAC, Net ID, Alias & Location columns mean that
the powerline network is encrypted with the default encryption key
(DHP-300). Follow the steps below to encrypt the network with a
non-default encryption key:
• Double-click on the nodes.
• Once all the nodes you want to encrypt with a non-default
encryption key, click the Configure button.
D-Link DHP-300 Quick Install Guide 10