In Japan, accessing a wireless LAN network without authorization is not a crime, even if the network is protected with a password. For example, unauthorized access, modification, or impairment of data held in a computer system is a federal offence under Australia’s Criminal Code Act 1995. When an unauthorized user accesses a computer network, he or she might be committing a real crime, depending on which legal code the unauthorized user falls under.
What Are the Possible Consequences for Someone Who Is on My WiFi?