Canon EOS 5D Mark IV L-series Standard Zoom Lens Kit Owner's Manual

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If security settings have not been properly set, the following problems 
may occur.
Transmission monitoring
Third parties with malicious intent may monitor the wireless LAN 
transmissions and attempt to acquire the data you are sending.
Unauthorized network access
Third parties with malicious intent may gain unauthorized access to 
the network you are using to steal, modify, or destroy information. 
Additionally, you could fall victim to other types of unauthorized 
access such as impersonation (where someone assumes an 
identity to gain access to unauthorized information) or springboard 
attacks (where someone gains unauthorized access to your 
network as a springboard to cover their tracks when infiltrating 
other systems).
It is recommended to thoroughly secure your network, to prevent these 
types of problems from occurring.
Security