[koponov]

A colleague and I are living in the same building but on different floors. His room is on the 5th floor while mine is on the 4th. We are planning to share his internet connection so we can save up on bills. We plan to have a LAN cable run down from his window to my window. The question is, is this kind of setup illegal in Japan? Is running a LAN cable on the side of a building, particularly an apartment, to share a connection, prohibited by Japan law?