Edimax Technology BR-6574n - Manual (Page 97)

3-4-2 Security Settings
This wireless router supports two types of encryption: WEP (Wired
Equivalent Privacy) and WPA (Wi-Fi Protected Access):
Please select an encryption method from ‘Encryption’ dropdown menu,
and corresponding setting will appear:
Disabled
Encryption is disabled. It’s not recommended to disable encryption
because other people may use certain wireless scanner to copy the data
transferred over air.