Consider a scenario where a person walks down a street trying each door. If he founds an unlocked door he goes in and looks around. Is this situation analogous to a hacker scanning ports on a computer and find an opened port and goes in and look around and take a few things. However, also consider that in computer terms, some ports are considered public ports (for example, port 80 where web pages are served from). For example, is it reasonable to assume that if port 80 is available, the owner of the site gives you permission to access the site. How far can you take this argument. For example, if a wireless signal is available, could you derived from that the owner gives you permission to access it? In some culture, a public water well or tap, is considered to be freely available to all that come passed. Should publicly accessible wireless signal then falls under the same category?