When connecting to a public Wifi from a café for example, some don't use a password and some do. If they do use a password it is often publicly known to everybody around.
Does having a password on the network, even though it is publicly known, make it more secure? Secure in the sense that it is harder for others to know what you are doing?
Or do these things depend more on type of Wifi (WEP/WPA), strength of the password, or using SSL?